My 10.5 has a fixed FSB. I'd love to be able to tune its gas down just a little. It'd be way too snappy if I had a can on it.
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Not at that time. His goal was to have a shorty that would run suppressed or unsuppressed with a single port size, without being over-gassed. Read Grant's post.
As an aside, was PapaBear using an enhanced bolt or standard bolt? If I recall, it was the early style enhanced bolts that proved to be unsuitable for shorties
PT, I'd strongly consider making your own SBR via form 1 versus buying a factory SBR. Current form 1 approvals appear to be running under 30 days. As far as barrel length goes, I've had great success with the 11.5.
Thank you, offline somebody had offered me some advice on this point. I'll have to further investigate and make sure I understand the difference between"making your own SBR via Form 1" vs. buying a factory SBR.
But, at this point, I'd "build" one simply by buying a SBR upper and then a lower, separately?
Or registering any existing lower as an SBR, and then buying the upper.
I know guys who simply register all their ARs as 10.5 SBRs regardless of what upper they have on it.
BCM Blemished, Noveske Chainsaw, or something like that - they're functional, and those blemishes only matter for resale value (which you're going to ruin by engraving anyway). eForm 1's are running smoothly (I at least got my latest reject letter in four weeks, so that should be a fairly quick re-submit after making an embarrassingly small fix), so that route works great.
As for the upper - if a BCM 11.5" KMR upper is an option, it's really hard to beat. An 11" handguard does everything I need it to, my compressed 8" handguard on my 10.5" upper only makes sense in the context of having a <29" OAL suppressed setup.
Since it's fairly possible to get a Blemished lower to Form1, you can afford to run some aftermarket stuff on it (VLTOR A5 on mine for a suppressed-only still runs awesome, GSSA, etc.). If BCM is still running those deals/steals on the KMR uppers, I don't see why not, unless you particularly want a Mk18 upper, or something else.
I see, I would just register one of my existing AR lowers as an SBR and then I can pop whatever upper I want on it? SBR or regular?
Exactly.