Reviews & Ratings for Cryptic 9mm PCC Bolt — 4 reviews — Page 1

I'm guessing the 1-star reviews are for Glock or Colt mag lowers. I built my AR-9 from a conventional AR upper and lower (Aero M4E1). The Mean Arms mags put the rounds almost directly in-line with the bore, so they chamber much more efficiently than the increased angle of pistol mags. You need the version with the ejector on the mag to work right, in this setup, but oh boy, does it! It even works with enhanced safeties (some mods to the weight required) ...ahem. Extremely smooth operation and cycling. Know that AR-9's are not Mil-spec and do your research on what applications the Cryptic works best with, and you won't be disappointed. The Kak K-spec heavy buffer for 9mm, and flat wire spring pair up well with this bolt, eliminating bolt bounce, and make a surprising soft recoil impulse.

This bcg I’ve had for about a year now, it’s not worked for about 6 of those months. In my 10.5 build, my 3.5, and my 16 inch 9mm builds this bolt carrier is junk. It short strokes in each one of my builds, you have to pull the charging handle back between each shot, the bolt will eject the round, but then to get another shot you must pull the charging handle again, If not the trigger is loose and does nothing when it is pulled. I know it is the bolt itself, because when taking my foxtrot mike and talon bolts and using them in the same build, it doesn’t have this issue. This bolt has this issue in all 3 of my 9mm builds. I emailed customer service and got no response, but this thing has been a headache and doesn’t work in all three of my builds while my other bcg do. It worked for a few hundred shots and then started having this issue, sending me down the rabbit hole of buying parts when the bolt was this issue.

I have already purchased several Cryptic Bolt Carrier groups. They have all been high quality and well made. ALL of them have passed when checking head space. I’ve had no issues so far. I have not yet finished this build but expect this bolt will function as expected. I recommend Cryptic Bolt Carrier groups and you can buy with confidence.