Another Grendel comes to life!

[kamrr4437]

I would think you need to use a rifle buffer in your Magpul PRS. The T2 buffer if im not mistaken is a carbine buffer. Maybe someone else can chime in. But thats the way i understand it for the tube that the Magpul PRS uses.

[LRRPF52]

Yes, you do absolutely need a rifle buffer in the PRS stock, unless you use a carbine buffer with a spacer in the tube like with the MGI RRB.

[FiremanTx]

What problems will arise using that buffer w/out a spacer?

[LRRPF52]

If you use a carbine-length buffer in a rifle-length extension tube, your bolt carrier group will impact the lower receiver at the threaded area where the extension tube inserts. You will basically damage the crap out of your lower, and the recoil on it will feel abusive.

Use a rifle-length buffer in rifle-length tubes.

[FiremanTx]

Ok, I thought with it being a heavier buffer that would prevent it from slamming too hard into the threads of the lower. Honestly I did shoot it today and thought the recoil was awesome, low and easy to keep on target. But I spent too much money to have that hanging over my head. I'm gonna post some pics of the range later on tonight.

[FiremanTx]

[FiremanTx]

[FiremanTx]

Hornady A Max, 123gr. - All are 5 shot groups.

[kamrr4437]

Great groups

[FiremanTx]

Thanks, I was more than happy with the results! Should have been better groups, but due to user error they weren't as good as they could be. I plan on getting out and shooting a lot more to try and fix that though. I was super happy with how it shot and the overall feel of the rifle.

[LRRPF52]

Ok, I thought with it being a heavier buffer that would prevent it from slamming too hard into the threads of the lower. Honestly I did shoot it today and thought the recoil was awesome, low and easy to keep on target. But I spent too much money to have that hanging over my head. I'm gonna post some pics of the range later on tonight.

With the muzzle break, you're not going to really feel any recoil, and will not have much muzzle climb, if any at all. Break open your rifle and see if there are any marks near the receiver extension threads on the curved portion. If you need a rifle-length buffer, let me know. You also need a rifle-length recoil spring. Carbine springs are shorter. There's a thread here with all the specs on the lengths and weights of the buffers.

On the buffers, that pad on the rear is meant to prevent the bolt carrier group from bottoming out or protruding too far into the lower. If you use a carbine buffer in a rifle buffer tube (receiver extension), it isn't long enough to stop at the rear of the tube. The rifle buffers are also about 5.2oz. so they are heavier than even an H3 at 4.7 oz.

[FiremanTx]

Very good to know! Thanks for informing me of that, I would have never known or even thought to check. It does have a rifle length spring and I also have the standard rifle length buffer that came with it so I'll throw that in there. I was just wanting to get as little felt recoil and muzzle rise as possible. I thought a heavier buffer might help, may look into a heavy buffer anyway. Will a heavy buffer make much of a difference with the muzzle brake? The good news is that I now have a T2 that I need to build a carbine around!

[kamrr4437]

Either that or just sell it to get your rifle length buffer. I tried the spikes tactical T2 in my AR-15 and ended up putting the regular one back in. But i ended using it in my Beowulf build.

[aclark]

What was the distance you shot at?

[FiremanTx]

100 yards.

[LRRPF52]

Very good to know! Thanks for informing me of that, I would have never known or even thought to check. It does have a rifle length spring and I also have the standard rifle length buffer that came with it so I'll throw that in there. I was just wanting to get as little felt recoil and muzzle rise as possible. I thought a heavier buffer might help, may look into a heavy buffer anyway. Will a heavy buffer make much of a difference with the muzzle brake? The good news is that I now have a T2 that I need to build a carbine around!

A standard rifle buffer is 5.2 oz., so there aren't many carbine buffers that can come close to that weight. Another thing about AR15 buffers for high-power rifle cartidges is that the reciprocating internal weights are important to prevent bolt carrier bounce. Some people figure throwing in a 9mm SMG buffer will do the trick because they are so heavy, but the buffer body is heavier on a 9mm buffer since there is no gas system or locking mechanism on a 9mm SMG. The series of carbine heavy buffers for the 5.56 Commando-length barrel guns are there to compensate for the increased gas port diameter necessary to run a 10", 10.5", 11.5", and 14.5" barrels.

Buffer - Weight Oz / Gram - Notes

A2 - 5.2 / 146g - Full Stock

Carbine - 2.9 / 84g - Standard Carbine - Aluminum body

Carbine- M4 3.8 / 107g - Standard M4 - Aluminum Body with 2 Steel and 1 Tungsten Weight

Carbine/M4 (H2) - 4.6 /129g - M4 - Aluminum Body with 1 Steel and 2 Tungsten Weights

Carbine/M4 (H3) - 5.4 /152g - M4 - Aluminum Body with 3 Tungsten Weights

9MM - 5.5 / 155g - Steel body with 3 Steel Weights

9MM (A) - 6.3 / 177g - Steel body with 1 Tungsten and 2 Steel Weights

9MM (B) - 7.1 / 200g - Steel body with 2 Tungsten and 1 Steel Weight

9MM (X) - 7.9 / 222g - Steel body with 3 Tungsten Weights

[bwaites]

I wonder why no one makes a buffer with extra weights, so you can try different options for your rifle?

[Variable]

A standard rifle buffer is 5.2 oz., so there aren't many carbine buffers that can come close to that weight. Another thing about AR15 buffers for high-power rifle cartidges is that the reciprocating internal weights are important to prevent bolt carrier bounce. Some people figure throwing in a 9mm SMG buffer will do the trick because they are so heavy, but the buffer body is heavier on a 9mm buffer since there is no gas system or locking mechanism on a 9mm SMG. The series of carbine heavy buffers for the 5.56 Commando-length barrel guns are there to compensate for the increased gas port diameter necessary to run a 10", 10.5", 11.5", and 14.5" barrels.

Buffer - Weight Oz / Gram - Notes

A2 - 5.2 / 146g - Full Stock

Carbine - 2.9 / 84g - Standard Carbine - Aluminum body

Carbine- M4 3.8 / 107g - Standard M4 - Aluminum Body with 2 Steel and 1 Tungsten Weight

Carbine/M4 (H2) - 4.6 /129g - M4 - Aluminum Body with 1 Steel and 2 Tungsten Weights

Carbine/M4 (H3) - 5.4 /152g - M4 - Aluminum Body with 3 Tungsten Weights

9MM - 5.5 / 155g - Steel body with 3 Steel Weights

9MM (A) - 6.3 / 177g - Steel body with 1 Tungsten and 2 Steel Weights

9MM (B) - 7.1 / 200g - Steel body with 2 Tungsten and 1 Steel Weight

9MM (X) - 7.9 / 222g - Steel body with 3 Tungsten Weights

Saved info! Thanks for listing that info all together. I hate trying to look that stuff up all the time.

[txgunner00]

I wonder why no one makes a buffer with extra weights, so you can try different options for your rifle?

Tubb's makes a carrier weight system that effectively does the same thing.

[FiremanTx]

Thanks for that list, that clears up a lot of things. I also found: http://www.heavybuffers.com/products.html They have an 11 oz rifle length buffer made of SS and a 6.5 oz tungsten carbine buffer and it says they can custom make one with different weight. I think I'm just gonna stick with the standard buffer for now and see how I like it. I really appreciate the list of buffers though, probably should have looked into that before I bought the T2.