Can I use a non KAC bolt carrier in my Sr-15?

[Manoloiv]

Greetings,


I would like to use a low mass Bolt carrier in my KAC SR-15 with the E3 bolt.

Will it work?


Thanks

[patriot_man]

Greetings,


I would like to use a low mass Bolt carrier in my KAC SR-15 with the E3 bolt.

Will it work?


Thanks

I would not change the mass of the bolt carrier.

The KAC system has been engineered to work well with the specific components in mind.

[Manoloiv]

Im trying to soften the backwards recoil impulse while speeding up the gun

I feel like there is a small delay similar to the scar 16 but not as pronounced.

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[Failure2Stop]

Greetings,
I would like to use a low mass Bolt carrier in my KAC SR-15 with the E3 bolt.
Will it work?
Thanks

We have painstakingly managed the recoil cycle of the SR-15 and do not see that a low mass carrier would be of any benefit, and likely would impair functionality.

[Manoloiv]

We have painstakingly managed the recoil cycle of the SR-15 and do not see that a low mass carrier would be of any benefit, and likely would impair functionality.

thanks for the reply regarding the low mass bolt carrier in the sr15. How can I minimize the backwards push i feel from my gun? It seems as though the recoil impulse is delayed similar to that of the scar 16 but not as pronounced.
I find my sr-15 has more recoil than the legacy mod 1.


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[TheChunkNorris]

What type of shooting are you doing exactly.

[Manoloiv]

What type of shooting are you doing exactly.

Classes, steel and targets


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[TMS951]

I have an early SR15 E3 upper.

It would not cycle some cheaper 55gr. Steel cased ammo, even with the supplied carbine buffer, it never cycled this ammo reliably even with a hot gun in the hot summer. It also would not cycle quality .223 ammo (Prvi 75gr.) in the cold. Because of not being able to further reduce buffer weight I was only able to reduce carrier weight. I purchased and installed a JP lo mass carrier. This fixed my problem. To further tune the system I went to an H buffer. An H buffer + JP lo mass carrier still weighed less than the milspec carrier and carbine buffer combo, but it allowed the gun to cycle my training ammo, and other ammo in the cold.

I only did this to fix a problem I had due to the gas port size of this gun. I believe since then the gas ports have been increased and this problem no longer exists. I you don't have a problem I probably wouldn't change anything.

When not running this ammo, and running 5.56 I went back to a full weight carrier and an A5 system with an A5H0 buffer.

[Manoloiv]

I read another thread and i believe that what is causing my muzzle to slightly move off point of aim under rapid fire is the bolt carrier hitting the buffer and then being sent into battery. Im not sure at which point it happens.


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[Failure2Stop]

I read another thread and i believe that what is causing my muzzle to slightly move off point of aim under rapid fire is the bolt carrier hitting the buffer and then being sent into battery. Im not sure at which point it happens.
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Nope.
The slight jump of the bolt carrier to meeting the face of the buffer is barely able to be seen on slow-motion film or captured with accelerometers.
What IS a factor is how hard the buffer hits the rear of the receiver extension.
All other factors being the same, the buffer that hits the lightest (or doesn't touch) will feel the least recoil.
However, relying on spring runout on an AR is a baaaaaaaaaaaaaad idea, and severely compromises function, especially when hot, dirty, dry, or changing environments or ammunition.

The third factor is the bolt carrier group slamming home to complete cycle of operation just before "firing". This is a very uniform force, messing with it is a super bad idea, and is gone while the gun is still in recoil anyway.

Now, here's the final little bit: experience and skill is going to do more than the muzzle device or springs will. I have won plenty of 2-gun and carbine matches with a nearly stock Colt 6920 (no brake/comp, no nice trigger) and decent glass over dudes shooting supertrick JP comp guns. Why? Because I got good at shooting that gun, and actually bothered to really zero and know my holds.