Cryptic Coatings 5.56 NATO AR-15 Bolt Carrier Group - Mystic Bronze
This Bolt Carrier Group includes a MIL-SPEC 8620 aircraft quality steel carrier with a shot peened carpenter no. 158 steel bolt. The M16 cut carrier is compatible with most AR-15s on the market and features a shrouded firing pin, a chrome lined interior, and a properly staked, chrome lined gas key secured with grade 8 fasteners. The bolt assembly includes a tool steel extractor with spring and Viton O-ring. A chrome finished firing pin is also included.
Cryptic BCGs are finished in one of six different coatings, each offering reduced friction, increased performance, and greater wear resistance than that of a standard bolt carrier group.
- Mystic Bronze - 5.56 NATO
- Physical vapor deposition coating
- Coefficient of friction: 0.2
- Hardness: 3200 Vickers
- Maximum temperature: 750 degrees Fahrenheit
- M16 cut bolt carrier
- High pressure tested
- Magnetic particle inspected
- 8620 aircraft quality steel carrier
- Heat treated to 60-61 RC
- Chrome lined carrier interior
- Chrome lined gas key
- Gas key staked with grade 8 screws
- Carpenter 158 steel bolt
- Tool steel extractor
- Viton O-ring
- Chrome finish firing pin
- MIL-SPEC cam pin
- Weight: 11.55 oz
Ratings & Reviews
What can I say, awsome!
by John -
First let me just say this bolt is so slick it feels almost wet when dry. Great bolt was a little pricey for my taste but life time warranty well worthy investment for a great bcg I have shot a little over 500 rounds in one outing everything just wiped off with a rag no real solvent needed.
by Eric B
I'll start by saying that I was the guy who bought the NiB bcg as soon as it came out back in the day, because the science made sense and they look good. Of course, I love my Mil Specs too, and I've worn out a few along the way.<br>With that said...holy cow is this thing nice. I did a full breakdown and inspection (I always change the extractor and ejector springs to Sprinco when I buy a bcg), and everything was of great quality. This thing is so slick, if you have any oil on your hands, you may drop it (and yes, you still need to lube it before you use it).<br>Is it better? Nah, they all do the job. This thing just looks pretty while doing it, and I spend about 1/3rd the time cleaning it. If you want it and have the budget, then go for it. It has stood up to my torture tests. I'm a firm believer that this is the second thing you should not skimp on- the first thing being the barrel.