Gunner’s Journal

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Posts Tagged ‘AR15’

MGI Military AR15 Buffer/Recoil Reducer

Posted by Gunner on August 7, 2011

Many shooters see assorted buffers advertised on various websites but many of these buffers are just ideas without any scientific design. The MGI buffer has been designed by engineers for optimum effectiveness in reducing recoil and rate of fire on semi or full auto AR’s. This buffer does everything it claims! Simply I’ve fired many 100’s of rounds from my 14.5 inch CMMG Carbine and this buffer will stay in this AR and any other I acquire.
The buffer also comes with a “D” ring which fits over the spring of the extractor. It’s called the “D-Fender”. It’s function is to increase extraction reliability and ejection force by a factor of 4X. A picture is shown below. It also works as advertised whether the rifle is very dirty of freashly cleaned.
I’ve tried just about every buffer on the market with mixed results. The MGI buffer made me a believer. Here’s how it works. The buffer body is a fairly lightweight steel with the base housing a spring loaded tip. Internally there are three Tungsten cylinders. As the weapon is fired the bolt moves to the rear againest the buffer body which in turn moves rearward under spring pressure. The Tungsten cylinders move forward againest the rearward pressure. Since there are three cylinders each one moves forward againest the rearward pressure slightly seperated. At the end of the recoil stroke all three cylinders have struck each other and stopped forward motion when the bolt has compressed the internal spring. The bolt then moves forward with the process reversed and the Tungsten cylinders moving to the rear. As I mentioned the rear of the buffer has a sturdy tip that is spring loaded and aids in this recoil reduction process. This also makes the buffer very reliable in function and in my opinion increases the reliability of the rifle. A simple way to look at it is taking two hammers and swinging them together one in the right hand one in the left. When they meet they cancel each others energy.
When I first got this buffer I installed it which of course took all of two minutes. I also installed the D-Fender over the extractor spring. I went to the range with the usual 55 grain plinking ammo. I could feel the difference in recoil with the first round fired. As I continued firing rounds I admit I got a bit of a smile on my face after finally finding a buffer that works! The price is higher than most but to me it’s worth the money.
When I fired about 100 rounds I decided to shoot some rapid fire to see just how effective the reduced recoil was at allowing me to shoot double taps into a small area without having to pause and re-sight using the EoTech 516. As it turned out I was able to fire my first round where I wanted it then not loose sight of the red dot and almost immediately fire my second round placing it within two inches of the first at 50 yards. Using the bipod the rifle moved very little allowing smaller groups than the first that were fired standing unsupported.
Body with rear spring loaded plug
Next up was a local PD’s select fire M4. The MGI buffer was installed and testing started. On full auto the results were startling. The rate of fire dropped by an average of 200 rounds per minute according to our PACT timer. In no way was there any adverse effect on reliability. Controllability was enhanced noticeably. I setup a small video recorder to compare muzzle rise. While muzzle rise with a standard buffer is not very pronounced with the MGI buffer installed it was almost non-existant when observed in the short video.This is where the buffer really showed it’s stuff. I also noticed less felt recoil on full auto. Any reduction in recoil is a very desireable factor when used in police work. Many agencies operate in crowded cities where repeat rounds fired accuracy is very important. The local PD was so impressed they left the range with plans to add the MGI buffer to both of the departments M4’s. I would post the video but the PD took it to present to the powers that be in order to justify the upcoming purchase:-)
The buffer is also self regulating so that any AR platform in any caliber is compatible. The rate of fire reduction is somewhat dependent on barrel length.
With the D-Fender installed my ejected rounds were going approximately twice the distance they had been as well as landing in a 2 foot circle. I feel certain the buffer will also reduce the wear and tear on your rifle as well.
Currently the buffer is being used by a number of law enforcement agancies as is the D-Fender. I would also expect the military to take an interest in these excellent additions to the M4. In a war zone any device which increases reliablity and accuracy is a big plus for any soldier or Marine.
I recommend this buffer and D-Fender ring without reservation of any kind.

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CMMG M4 Carbine From Black Rifle LLC

Posted by Gunner on January 25, 2010

Black Rifle LLC     Columbia,Missouri   

   This is a new AR15/M4 carbine from the retail outlet of CMMG out of Fayette, Mo. I can tell you if you love AR15’s when you walk into the Black Rifle store you will have a very hard time leaving:-) They carry in stock every configuration of AR15 you can imagine at reasonable prices. You’ll also find many tactical type shotguns as well as various brands and configurations of AK47’s. Optics of every major brand, ammo, Magpul PMags as well as many other brands of mags. They also have accessories for any tactical rifle or shotgun. They also take trade ins and have used rifles for sale. The place is just a wall to wall AR lovers dream:-) Also CMMG rifles have a lifetime warranty.

CMMG AR15 14.5 inch barrel as bought at Black Rifle

    This is the second CMMG I’ve had and I couldn’t be more pleased with both of them. This one was purchased as you see it above for $870. When you consider it came with a 14.5 inch barrel, Yankee Hill rail, Tango Down grip. Clubfoot stock, Magpul magazine,Phantom flash suppressor, Troy front and rear BUIS, match trigger well you just can’t beat the price especially these days. The barrel also has a 1 in 7 twist which is a good all around twist rate for an M4 style to obtain the best accuracy from standard 55 grain bullets all the way up to the 70 plus grain hunting bullets. It also does very well with 22LR bullets in 38 grain with the conversion kit but more on that later.

As it looks now completed with Aimpoint M2 red dot, Surefire light and mount and Spikes Tactical VFG

   This by far is the best setup I’ve ever had in an AR15/M4 configuration. It has all I need and no extra bling I don’t need. No I’m not going to paint it with a spray can to mimic a real desert warrior because I’m not my son is! Enough on that subject:-) One addition I didn’t mention in detail is a best buy and that’s the Spike Tactical forward vertical grip. It was listed on the website at $35 so I thought it has to be plastic. When it arrived I was plesently surpised to find it is CNC machined aluminum with an anodized finish with rubber rings that fit in the ecternal slots to provide a better grip. This a real deal considering many of the plastic models are $80 plus. This VLTOR stock gives a great cheek weld and provides waterproof space for battery storage as well as other parts. The new Magpul magazines are very reliable and cost is no concern at all. They have a window in the side of the mag with a red line that travels as you deplete ammo and tells you right away how many rounds are left without guessing or taking the mag out to look. A very handy mag at $18.

 This view gives a better look at the Viking Tactics light mount

   The last addition I just purchased allows me to practice a lot more without spending a ton of money of 5.56 for practice all the time. That addition is a CMMG 22LR conversion kit. Most of these kits I found were at the $200 mark but I found mine at Dynamic Armament for the regular price of $139 which included a 22LR magazine. I’ve shot about 500 rounds in the last week of American Eagle 38 grain 22LR without one malfunction and there was no cleaning during the 500 rounds fired. I strongly recommend this conversion so you can practice all you like without breaking the bank.
    Changing out the standard unit for the conversion is very simple. You remove the charging bolt 3/4 of the way out and remove the 223 bolt then slide in the 22LR conversion bolt, close the rifle up and insert a 22LR mag. That’s it your ready to go. These mags also hold 26 rounds of 22LR.
   Shooting this rifle with the conversion is a blast! Accuracy is extremely good. Standing unsupported at 25 yards you can shoot 1/2 inch groups all day long. This is not something I expected since this rifle was in no way constructed to fire 22LR as the new batch of 22LR only rifles made by Sig and Colt. I’m not griping believe me. Even at 100 yards groups of two inches or a little less are common. CMMG makes a fine product regardless of some who look down on them because they don’t have one of those high profile names even though they supply to the military just on a lower profile.
This conversion kit is available from Guns for——-Great folks to deal with!

CMMG 22LR Conversion Unit with one extra mag

   On to shooting with the 5.56. I tend to use brass cased ammo but I’m in no way appossed to using Wolf or Bear brand steel cased ammo. I have never repeat never had a rifle adversly affected by using them. After putting on the red dot sight I set the BUIS sights up as well so they co-witness. I began at 50 meters since that is the advised distance to sight in so that all shots out to 300 meters are accurate. After sighting in I started at 25 yards standing unsupported. My groups were less than 1/2 inch and closer to 1/4 inch. This is a much more accurate AR15 than I have ever owned before. I moved out to 100 yards and setup a rest and fired several groups at a 5 inch Birchwood Casey target which is much easier to see at that distance. I was shooting groups that made one hole right on the red bullseye of the target. As I said this is a very accurate rifle! These groups were shot with PMC brass cased ammo. I changed over to Wolf and the groups opened up a bit but still came in at less than one and a half inchs at 100 yards using the red dot.
  This is one nice rifle that performs very well and sells at a very reasonable price. Black Rifle LLC is also a very good dealer who has excellent customer service and would be worth anyone checking into if they don’t mind having a rifle shipped to the local FFL they frequently use. Black Rifle will also build one to your specs if they don’t have one in stock already:-) As always if you have any questions please comment and I’ll answer any question you may have. If I don’t know the answer I’ll find it.

Happy Shooting!

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AR15 From CMMG

Posted by Gunner on October 12, 2008


I ran across a new manufacturer of AR15’s named CMMS. They are a small company in Fayette,Missouri. I stopped in to Mark’s Armory and saw this AR and saw that it was a bit different than most run of the mill examples. The lower is a DPMS with collapsible six position stock. The upper is the heavier variety found on match AR’s. The upper is also from DPMS and is the upper used on the Panther Race gun. In fact the upper is almost twice as thick as the steel on a standard model which makes this rifle more stable and therefore more accurate as it turns out.The upper is also made from extruded aluminum alloy. There is no forward assist or dust cover which is fine for the average shooter. The foregrip is a free float barrel type with an M4 chrome lined barrel from DPMS.

In this picture you can see how thick the metal is on the upper

All of the parts used are very good quality. Another addition that CMMS added is a cheek rest from Command Arms. This rest is very easy to add to any AR15 and provides a very good cheek weld when sighting. It also has two water tight compartments for carrying battery’s or other odds and ends. It an excellent addition for your AR.

Command Arms Cheek Rest

After deciding to take this one home with me and hoping my wife wouldn’t kill me I saw some scopes that looked a lot like an ACOG. Not being one who can afford an ACOG I was interested. The company that makes these is NC Star. I know I know they are inexpensive but not cheap if you know what I mean. I expected an $85 scope to be blurry and just not very clear at all. I was surprised to see that I was wrong the optics are very clear as is the Mil-Dot reticle. There is a rheostat on the left side that runs off a watch type battery. Turning the knob clockwise the reticle turns green with one more notch dimming the reticle. Turning it counterclockwise and the reticle turns red. Handy for low light situations. With the power off the reticle is black. It has an eyepiece adjustment for nearsighted or farsighted people at the rear of the scope. They make several variations of this scope but this one is a straight 6X42. At the top is a knob for bullet drop calibrated for a 62 grain .223 round. Range on this 100 to 500 yards. The reticle as mentioned before has the Mil-Dot crosshairs if you choose to use this feature instead especially if you happen to use a different load than what the scope is calibrated for. The knob on the right side is the standard right and left windage adjustment. One click is 1/2 inch at 100 yards. Mounting is very simple since this scope uses a lever to lock the scope in place. Removing it and replacing it had no effect on the zero. We’ll see how it holds up over time and many rounds of recoil. So far it works very well.

After getting it home I cleaned the rifle and lubed it with the usual Militec. I went out to the range and setup at 100 yards to sight the scope in. It only took three rounds to have it right on the money. I fired the group below at 100 yards standing unsupported. The results are pretty good:-)

The circle is about 3 inches across

After this group I used a sanbag rest off the bench and had groups that averaged about 1 3/4 inches using Black Hills 62 grain match ammo. I moved back to 200 yards and had groups open up to a bit over 2 7/8th inches with the same ammo. This is certainly better than the groups I’m used to with the standard AR15 having the stock upper and non free floated barrel. This is certainly not your stock configuration but it looks good and shoots very well. To get a nice AR such as this one for $680 and a decent scope for $85 it won’t break the bank.
With the elections coming up very soon and should Obama win you better stock up on ammo, hi-cap magazines and any “black rifle” you have been yearning for because if he gets in office the push to take away our guns will be a high priority with him or so he has said. If you think the last assault weapons ban was bad you ain’t seen nothing yet!
On the main blog page at the top is a link to Mark’s Armory if you are interested in an AR15 like this one. You sure can’t beat the price especially for what you get!

Troy Single Point Sling With Mount

As always I wish you safe shooting and an enjoyable time at your range. Remember comments and questions are always welcome.

Posted in AR15, Military and Police Rifles | Tagged: , , , , | 4 Comments »

Rock River AR15

Posted by Gunner on March 31, 2007

M4 Rock River

My newest addition is this Rock River Arms AR15. It has a Yankee Hill free float rail system, a national match trigger and a medium gas system which makes it more reliable and is easier on the gun over time. The barrel is 16 inches heavy profile. The trigger pull is just under 4 pounds and is a two stage type. The barrel is a chrome lined Wilson Combat. The chamber is also chrome lined for greater durability and easier cleaning.
My scope is a Leatherwood ART 3×9 (automatic ranging and tracking). This scope is intended for use with the 5.56 or .223 round on the AR platform. I also have an EoTech 512 Holographic sight for use up to 100 yards. Beyond that and the Leatherwood goes on. I’m going to add a front and rear iron sight set as well as a single point sling. Later I’ll probably change the stock for a Vitor type and put a Magpul grip on it.
I have only been out once and shot about 50 rounds. I found that it is shooting approx. a 2 to 2 1/2 inch group at 200 yards. The barrel is factory lapped so it needs no break in time.

Posted in AR15, Military and Police Rifles, Rock River AR 15 | Tagged: , , , | 2 Comments »