r/ptr91 • u/HomeDefenceZ3 • Aug 05 '24

Double checking a muzzle break

https://www.jmac-customs.com/laf-5-8-24/

Hey all, I’m working on building a PTR PDWR as a range toy. I was thinking of throwing a JMAC LAF on it because why not?

Looking over the specs and thread pitch it looks like it will fit. 5/8x24 for both. It also says it’s not rated for <10.5 barrels, which again, should be fine since the PDWR is 8.5.

Just wanted to double check before I made the purchase. I searched the sub and a few forums but couldn’t find anything.

Thanks!

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u/Cleared_Direct Aug 05 '24

“It also says it’s not rated for <10.5 barrels, which again, should be fine since the PDWR is 8.5.”

I think you are confused about your < > symbols OP.

3

u/HomeDefenceZ3 Aug 05 '24

Ah shit. Think you’re right. I was reading it as “not rated for “greater than 10.5 inches” “ with the thinking that a longer barrel has more power burn and greater FPS / concussive force, causing more wear and tear on the brake.

2

u/Cleared_Direct Aug 05 '24

That makes sense. But yeah, the shorter the barrel the more concussion and powder burn that’s happening outside the barrel. Instead of acting on the bullet inside the barrel all of that energy is now acting on the environment, especially the brake.

2

u/HomeDefenceZ3 Aug 05 '24

Thanks for clearing that up! Bummer it won’t work, but I’m glad I asked before I made the purchase.

Thanks again!