The mailman cometh and he hath brought me an upper! PWS apparently didn’t take it too hard that we took so long to get a review out for their MK 107 pistol, as a new .300 BLK upper showed up at my doorstep today. I’ll be slapping this bad boy on the SigBrace-equipped pistol lower that shipped with the MK 107 and hitting the range soon . . .
Like any review, we’ll test for function with 250 or so rounds of ammunition from Freedom Munitions, and about six or seven different types of premium ammo from 110 gr. Barnes all the way up to 220 gr. subsonics from Gorilla. Additionally, Nick has been nice enough to loan me his 7.62 SDN for use in testing suppressed function.
In case you weren’t familiar, the MK 107 is a piston driven, nine inch barreled, AR upper chambered in Nick’s favorite cartridge, .300 BLK. Because .300 BLK was originally designed for a nine inch barrel, this is supposed to be the bee’s knees when it comes to .300 BLK. Nick spent a lot of time and money coming up with his perfect .300 BLK rifle detailing all the steps necessary in a post last fall. You’ll notice that he ended up back at nine inches and stuck a 7.62 SDN on it. This pistol isn’t exactly like his perfect rifle because SBR paperwork takes a long time, but it is going to be pretty close to the real deal.
As always, you can expect an honest and thorough review of this gun in the coming weeks. Stay tuned, we’re about to have some fun.