9mm comp actually do anything?

[chp5]

I'm building a PCC and considering just using a thread protector instead of a comp to keep the barrel shorter.  Does a comp on a minor PF PCC actually provide any functionality?  Thanks.

[Maximis228]

If you handload with a slower powder, yes. Otherwise You most likely wont notice a real difference.

[gerritm]

I am shooting a Kaw linear comp on my JP barrel and it does push back due to the design. I have had several other shoot it as compared to other PCC's and they all have said they can feel the directional push. Now it is not alot, but is there.

 

gerritm

[chp5]

5 minutes ago, Maximis228 said:

If you handload with a slower powder, yes. Otherwise You most likely wont notice a real difference.

 

I handload with Titegroup. 

Edited June 30, 2017 by chp5

[DWFAN]

Im not sure about a rifle, but put a comp on a pistol at a 45° angle and you'll see what kind of impact it has. Even with a 127pf 115gr bullet and Titegroup load.

It wasnt subtle.

[Hi-Power Jack]

35 minutes ago, chp5 said:

 

I handload with Titegroup. 

TG is a fast powder.

 

Slow powders are HS6, WAC, etc.

[Aircooled6racer]

Hello: HS-6 at minor loads is very dirty. I use Tite Group and the comp is more of a barrel weight than anything else. It also helps to direct the sound so the timer can pickup the shots. Thanks, Eric

[longbeard]

I use Titegroup.  No difference I can tell either.

[Pirate]

I can tell a bit of difference in going from a JP knockoff comp to a MBX.  I load 3.0 of TG under a 147 blue.

[1911luvr]

It made a big difference for me in USPSA shoots. With a flash hider I would get a significant gap between double taps due to muzzle rise, and lots of dot bounce. With the comp installed I get only a super tiny dot bounce and zero rise so that both A zone shots are A zone hits.


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[Tom Freeman]

Night and day difference for my short barrel Sig MPX.

 

Might not be that much difference on a non-SBR rifle.

[mscott]

SBR, yes. The 16" gun I just tested today, no. I tried with comp on and off and really could not tell any difference. Then again I need to work on tuning the buffer system as well.

[L9X25]

Having some difference is expected, even if it is not redirecting gasses beneficially, it is adding weight to the muzzle and reducing the flip slightly as a result.  

[gunther]

According to shootersnotes.com which uses the powley computer formula, powder gases equal about 8% of the recoil.

for a 115gr 9mm bullet going 1152fps from a 8.5in barrel.

 

So i would have to say muzzle brakes on 9mm carbines are just fancy thread protectors!

 

 

[BigBamBoo]

I know the JP comp on my GMR-13 upper works GREAT at catching lead. I have to use a brass chisel to remove all the lead fouling after a few hundred rounds.

 

As for reducing muzzle rise....can't say.

[BlackBuzzard]

Thy're a great conversation starter at the match.