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Karre

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Posts posted by Karre

    Best PCC barrel length

    in Pistol Caliber Carbine

    Posted

    7 minutes ago, TRUBL said:

    yep.....we pretty much settled on 1016 as being optimal.....1316 being on the extreme end of it. We pretty much only deal with 16" barrels, but don't be surprised if we offer a 10" or 13" solid barrel in the near future

    Thanks for your reply. But I don't get it, why is a 10 inch better then an 8 inch recoil wise. I understand that it's hard to notice any difference but I can't help my curiosity. The muzzle velocity is pretty much the same, but a little little less dwell time with the 8 inch.

    Best PCC barrel length

    in Pistol Caliber Carbine

    Posted · Edited by Karre

    On 2/19/2020 at 6:09 PM, TRUBL said:

    Here at TACCOM....we've found that a 5.25" has such a fast impulse that a brake really does not show any improvement on dot bounce and Getting the recoil system set does more than a brake does for felt recoil.....and to that end, we've kept with that length barrel for the 16" UWL barrels.

     

    We've since come out with a 1016 barrel and a 1316 barrel......10" and 13" respectively with pinned and welded brakes to make them 16" legal. It appears that the optimal length for the brake to work for least amount of dot bounce is in that range.....giving the nod to the 10" length. The problem with a 10" barrel/brake is hand guard length. We've been able to fashion our Carbon Fiber Hand guard to 11", but some like it longer than that. The 1316 barrel allows for a 13" carbon fiber hand guard, which is only 1" shorter than our standard 14" hand guard.

     

    Overall.....both of the new barrels have been able to use the gas much more efficiently than a 16" or even our older 14.5" barrels that we've had in the past. 

     

    If you look up '9mm by the inch'......you will see that velocity loss in a 10" or 13" barrel is insignicant. And to be honest, there really isn't much lost in a 5.25" barrel either....like maybe 100fps and that for the most part is the same hold over at just about any distance out to 100yds.

     

    Have you tried 816 or 616? I can cut mine to 5 inches but I want a longer handguard and will make a shroud past the handguard. But is better with 8 inch and 4 inch comp and 9 inch handguard? Some say 10 inch is best for a comp, but why not anything from 6 to 10? I don't need 16, just want is past a 9-10 inch handguard for safety. A 6 inch barrel and a 6 inch comp would that. But would it be better with an 1014 type?

    Got gas in my eye, hacksaw time!

    in Pistol Caliber Carbine

    Posted

    Maybe I could accept a shorter hand guard. But I haven't tried anything that short. But a friend has a 10 inch barrel so I will test his upper on my lower some time.

    It's geco 124gr factory ammo that give 160pf. I would like to find some less powerful but Geco isn't known to be "hot". 

     

    My scs is already short stroke. So I have to try some tungsten weights.

     

    Don't you think a shorter barrel will effect needed lockup time?

     

    And I haven't noticed anything with glasses so I don't think it's much gas slipping by.

    Got gas in my eye, hacksaw time!

    in Pistol Caliber Carbine

    Posted

    I have a 24c. Dont remember what springs are in it. Have to check. I know hammer springs make a difference. But since I'm cutting the barrel at least 2,5 inch I'm going to start with that.

    My barrel are thicker (for comp support) at 14,5-16 and 8-10 inch. But maybe my gunsmith can add some material at 12 inch. Its 16mm or 19mm in diameter.

    Got gas in my eye, hacksaw time!

    in Pistol Caliber Carbine

    Posted · Edited by Karre

    I think I understand the physics. But the needed lockup time is depending on how long the bullet is in the barrel, pressure will drop quick when it leaves. But maybe I need a 8 inch barrel to notice the difference in lockup time.

     

    JP tungsten weights are more expensive than gold here. And if I going to cut the barrel I can start with that to see how the lockup time changes.

    Got gas in my eye, hacksaw time!

    in Pistol Caliber Carbine

    Posted

    So I shot my pcc without glasses for the first time today and got gas in my eye, more then I think it should be. I'm still playing around with buffers and so on, but now I want to start with deciding how long my barrel should be. It's 16 inch now and I can cut it as mush as I want. But it could be good with 16 with a "pinned" comp, if there isn't any benefit on going shorter. 

     

    But what is the "perfect" length with a comp? I use the gun for IPSC and Steel challenge.

     

    It's a QC10 receiver, barrel and bolt(without the extra weight in it) and a JP Enhanced silent capture (2 tungsten, 3 steel). So either it's more buffer weight/more spring pressure or a shorter barrel to start with. Looking on super slow mo it seems to recoil hard with 124gr ammo (160pf).

     

    I like to have my hand stretched so a 12 inch handguard is probably the shortest I will accept.

     

    Thanks!

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