FailZero Bolt Carrier Group BCG, 7.62X39, Nickel Boron Coated, No Hammer FZ-7.62X39-01-NH Specifications for FailZero 7.62 X 39 Bolt Carrier Group (BCG), No Hammer: Manufacturer: FailZero Finish: Nickel Boron Cartridge: 7.62x39mm Gun Make: AR Platform Gun Model: AR-15 Bolt Material: Steel Carrier Material: 8620 Steel Package Contents: FailZero 7.62 X 39 Bolt Carrier Group, No Hammer
electricalguy –
The bolt carrier group does exactly what it is designed for, as it has a enhanced firing pin for stubborn primers, if you want to shoot the bottom of the barrel Tula I would recommend an extra power hammer spring.
Surecool –
The bcg is a work of art with polished nickel boron. I only have about one hundred round with it and it functions flawlessly. Optics planet has the best prices and customer service…………………………..'………………………..
DUSTYN –
I feel that these BCG's are the slickest highest quality NiB coated 7.62×39 option out there, and never assume other NiB coated ones should be considered to be the same quality as these! However, I feel like there's a strange collision in dimensions in an AR in this caliber and I will try to share what I've had to learn the hard way. Bear with my numbers, this may help you. GI spec I found for the bolts overall length is 2.800" center of spec. GI firing pin from the front of the flange that stops its forward movement against the back of the bolt, to the tip of the pin is 2.707" center of spec. I've measured random Enhanced firing pins to be 2.717"-2.720". I've found typically from the front of the bolt to the face of the bolt that the firing pin protrudes from is usually about .124" deep. Lets say for example that you buy a BCG and measure all the parts, and the bolt is 2.800", the enhanced firing pin from flange to tip is 2.717", and the bolt face depth is .124". (2.800"-.124"= 2.676") then take 2.717"-2.676"= .041" calculated firing pin protrusion. I dug up some old specs from across the pond for the 7.62×39 cartridge. Required pin protrusion said .047"-.060". Doesn't add up to me, (also fought many failures with different setups) so I now machine the back of the bolt down to get at least .050" firing pin protrusion and I've never had a light primer strike since, even with stock hammer springs. I believe that the bolt overall length spec for a 7.62×39 AR should NOT be 2.800". I have since cut every one down, and they will eat tula and other hard primers for lunch. Hope this helps somebody, this should always be checked on this setup.
Robert in Bama –
This “Fail-Zero” bcg has a disclaimer it might not be reliable with Tula ammo. Well they are right, it’s not. Out of about 60-80 rds it had a FTF on two rounds. That’s not good odds especially since it’s called fail zero. The same two rounds it wouldn’t fire worked fine with my PSA bolt and firing pin. Go figure. I fired literally hundreds of rounds with my PSA bolt and firing pin in two different carriers. One designed to work with AK mags and a standard carrier. The only reason I didn’t give this over priced bcg one star is the coating is pretty good. I have yet to try the PSA firing pin with this setup but I’m hoping a new pin will do the trick or it’ll be used for more expensive ammo. Time will tell.