As many of you will no doubt recall, I’ve been very skeptical of ‘pistols’ based on military autoloading rifles. I’ve consigned several of them to the Deepest Depths Of Uselessness abyss and many of you have vigorously exercized your God-given right to disagree with me. Loudly. Primary Weapon Systems has just loaned us a very posh MK107 AR pistol for testing, and as I play with this $1900 specialty firearm, I can feel my curmudgeonly skepticism starting to erode. If I’m ever going to change my mind about MSR-based pistols, this Wylde-chambered piston gun will be what does it . . .
That’s no DI gas block: it’s an adjustable gas port, which drives the slender long-stroke piston at the heart of this PWS’ action.
And here’s the other end of that slender piston, directly connected to the PWS piston bolt. It’s incredibly clean right now, and I fully expect it to stay that way.
Completing this brief stem-to-stern tour of the MK-107, this shows PWS’s in-house locking castle nut (which isn’t actually a castle nut), the BCM Gunfighter charging handle and the rear half of the Magpul MBUS sight set.
This beauty showed up just a few days too late to join me shooting in the pouring rain last weekend. So it won’t spit any lead until next weekend because we’re driving the sprog to a gymnastics meet this weekend. Next weekend, MK107…next weekend.