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Posted: 4/12/2014 6:07:45 AM EDT
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Hey all, looking for any folks who might have first hand experience with running a QD can under a FF handguard.
I couldn't resist the shorty temptation any longer after PSA put a big chunk of the components on sale for Easter this week and I'm building a AR Pistol (to be SBR'd) and with everything ordered but the barrel and forearm I'm down to trying to figure out those. I'd like to run the system with a longer forearm for a few reasons, longer sight radius for BUIS, I'm 6'4 with arms to match so scrunching up on a short forearm for me isn't great and I'd like to reduce can 'branding' and pants burning during transitions to side arm after a few mag dumps. A smoking hot can on your thigh / groin area is... eye opening. My concern obviously is getting the thing on/off. The specifics are it's a AR in 300bo, either a 8.5 or 10.5 barrel (still trying make up my mind there, longer barrel if I can't run the can under the ff so I can get another 2" of forearm length, shorter barrel if I can run it under a FF. I'm leaning toward a Midwest Industries forearm, I really like the two I'm currently using and the price is great. The can (another couple of months hopefully) is a Specwar 7.62. I have a Octane 45 HD I'll use just for subs while I wait but the 7.62 is what I'm planning on this system for the extra 10-12db noise reduction and secure lockup. So long story short, anyone know how much of a PITA it is to run a Specwar 7.62 under a FF forearm and if so what FFF's work or don't work or work 'well enough'. I don't need a 'tool-less' removal or a 3 second removal but I do need to be able to remove it as it'll also be used on another host from time to time. For the curious and since it seems to be a thing, the build is listed out below. This is designed to be a 'moderate bargain' build, saving money where it doesn't effect function but with a few minor upgrades here and there. I don't 'need' another system, I don't 'need' an SBR, I don't 'need' my wife yelling at me, I just wanted a cool little system to satisfy the kid in me. And of course for being able to take out zombies silently without pulling a horde of them down on me  -
PSA Blemished Upper + UPK PSA Blemished Lower + LPK PSA Pistol Kit MOE PSA Premium "FA" BCG Cobra Tactical Fore Grip ALG ACT (with JP springs if needed to get to 5#) KNS Anti-Rotation (I just like the look, not because I expect the pins to fly out) Specwar Muzzle Brake Ranier Arms Ultramatch (8.5 or 10.5) pistol length in 300BO BCM Charging Handle (with RTV fix if needed) BCM low pro gas block SIG Arm Brace (wink wink - will be replaced with MFT Minimialist once stamp comes in) PA Advanced Red Dot . |
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I don't see you running high volumes of fire through a .300, but there will be some heat transfer.
I've got a Ti Phantom in jail to run on my 8" .300 with a 11" rail, I even sleeved the rail to shooting it unsuppressed would be safe from blast with my hand on the front of the rail. |
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The OD of the Specwar is 1.5, the locking ring is slightly bigger. I wanted the slimmest rail I could use for my set up but found that all the good rails that are worth a damn won't work. Looks like the only options are either a seekins or spikes bar or similar to tuck the can, or go with a longer barrel and get any rail you want. YMMV. Good luck.
Here is my set up Spikes lower and upper Spikes buffer tube kit SLR DA7 gas block Raptor CH Spikes KNS pins 9.25 inch HM Defense barrel 5.56 8 inch URX 4 rail The usual magpul furniture Specwar MB 
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I thought about heat but, not having shot a 300bo at all much less through a can, in just looking at the materials involved in the subsonic loads, I didn't think it would be too bad? I know the slimline furniture on my HK91 does get a tad warmish with long strings of quick firing but I'm making an assumption that 300bo runs significantly less? From what I've seen on the numbers it's going to run a little warmer than say a .45 pistol?
If it's not really going to work the 2" OAL increase from using a 10.5" versus a 8.5" isn't a showtopper. And I have, best case 10 weeks before I have a real chance of breaking the specwar out of jail. So plenty of time to make a final choice. But I really do like the look of the suppressor peeking out in the forearm. :) |
I really wish people wouldnt speculate on shit they have no idea about. 300blk does not give off near the heat that even 223 does. Ive done a 30rd mag dump of supers with no gloves and my hands were fine. Ive got a 7.62 specwar in eform purgatory and it fit just fine under my MCSR. Had to use my knife to twist the locking collar but it worked fine and I dont plan on removing it very much at all. Its definitely quieter than my ti phantom. |
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