I think the only thing superior with x39 is the ammo is cheaper. Ballistics and terminal performance seem to favor the more streamlined 300 blk bullets and the TSX. The ability to run standard mags and I seems that the x39 bolts are more fragile. Are there mags that are reliable with ARs now? Those are the reasons I went with 300 blk. Have things changed?
A large, county level, local LE agency invited all manufacturers to a gel test for potentially changing their current duty load for 16" patrol carbines and 10.5" SWAT SBR's. Reps for Winchester, Speer, and Hornady were in attendance. All cartridges performed as expected in the 16" patrol guns, for better or worse.
There was also a local AR builder there, retired from the same agency, and he had convinced some of his old SWAT pals to test a 7" build he had. This was done after the formal testing. To his credit, it ran well, but each and every projectile used to run the same FBI protocol test failed in bare gel. Each yawed, and exited the fresh from a cooler, and calibrated, block. I can't remember which did which, as testing through a 7" barrel wasn't relevant (just interesting) to my purpose there, but some projectiles yawed completely and exited the rear of the block, the result of which is over-penetration. Others yawed to a degree and exited one side or another. Only a couple were tested through what was left of the auto-glass, none of which made it close to 14".
Keep in mind, this was one day, with one 7" gun, and one FBI trained individual facilitating the test, but it is consistent with the average outcome of projectiles not reaching the bottom of their velocity performance window. I've made it a point, and habit, of avoiding open and public discussion of specific performance results I've seen in testing, as it could be misconstrued. I'm only sharing this because ALL 5.56/.223 cartridges failed the same test from a 7" barrel, which seems relevant to the discussion here.
Last edited by StraitR; 03-29-2020 at 11:20 AM.
I’ve seen wording that seems like it was meant to snag Uzis and other similar pistols. But, you are correct - regulating outside the grip is more common. Here in IL AR pistols were commonly banned by municipal ordinance until preemption came in with FCCL, but the code is usually still on the books and so far as I know there haven’t been any test cases to knock them down. The towns with AWBs on the books tend to be progressive enough to say fuck you to the idea of preemption.
Ken
BBI: ...”you better not forget the safe word because shit's about to get weird”...
revchuck38: ...”mo' ammo is mo' betta' unless you're swimming or on fire.”
Sample of one, but mine was a normal pistol that I rebuilt with a HB Industries “K” kit and their trigger group springs. My logbook isn’t next to me, but I believe I’m about 950 rounds since I made it a krátký. No functional issues at all, it has run 100% since new with around 1.2k in. Most of that has been Lawman 124 gr with the remainder WWB 115s I only use factory 20 rounders. Recoil is stout for what it is, but is not an issue.
I specifically didn’t want the first version CZ Micro with the telescoping brace (not a fan of the cheek weld), but I see now CZ is offering a version with a SB Tactical brace. I still prefer my version with the CZ extension and hinge and a GHW Tailhook mod 1 and adapter. Believe it or not, I make a point of shooting with the brace as intended every session - IMO the Tailhook is much more practical than the rubber chicken and Velcro braces.
Ken
BBI: ...”you better not forget the safe word because shit's about to get weird”...
revchuck38: ...”mo' ammo is mo' betta' unless you're swimming or on fire.”
The MVB stock doesn’t have the issue other PDW stocks do with fighting the buffer spring on assembly/disassembly. It also uses any standard BCG. I also have no complaints about the cheek weld but I’m a nose to charging handle kind of guy. And it shoots very nicely event without the can.
And for folks talking about a PCC, there is still a significant size advantage over even an 8.5” AR. It’s of course 300BLK because going shorter than 11.5” with 5.56 is just not smart.