Q: What kind of warranty does the x39 BCG have ?
A: The carrier and polymer buffer are lifetime warranty against manufacturer defects. All other small parts are known replacement parts and are not covered by warranty other than the bolt assembly comes with a 4-month warranty against manufacturer defect by OEM.
Q: is this complete with the firing pin??
A: Yes, the 7.62x39 bolt carrier group comes with an enhanced firing pin. This carrier is complete and ready to drop in for use in ones rifle.
Q: I'm interested in your 7.62x39 BCG... My question is: how does it perform in PDW/SBR? I would like to run it in my 7.5" bbl and I'm concerned about cycling issues and if it would be necessary to adjust my gas settings!!
A: It will run fine in PDW/SBR. You would only need to adjust the system if your gas port is oversized. We run PDW in Piston and Direct Impingement all the time. Here is a video of us running PDW with our Piston Upper which uses our BCG with integrated buffer: https://youtu.be/E4nDGzL2fRg
Q: has the bolt been MPI'd?
A: The manufacturer of these bolts does not state if they batch MPI or not. Information they do provide us is: Bolt body produced from AISI 9310 VAR (Vacuum Arc Remelt), the highest standard bolt material made
Machined complete in one operation; this eliminates tolerance and repeatability issues that arise from the multiple fixturing processes used by other manufacturers
Enhanced Design for upmost reliability
Tightly controlled proprietary heat treat process to accurately control cast depth and core hardness
Extractor produced from MIL-S-5000 steel and vacuum hardened
NSCW Crane Division extractor upgraded with Viton® o-ring, 5 coil spring, and plunger
Q: Do you guys sell replacement polymer buffers?
A: We do sell replacement polymer buffers to only customers that have purchased one of our bolt carriers.
Q: While i understand a x39 bcg can't run in a 6.5 Grendel chamber (due to the .11 difference in headspace from the .125 to the .136), im curious, has this bolt ever been tested in a 264 LbC chamber with the proper type 1 head space?
A: If the barrel is headspaced for the .125 it should work because the case dimesions are identical to 7.62x39 where the case interfaces with the bolt and extractor.
Q: What type of cleaning solutions can you use?
A: You can use any firearm cleaning solution(s) as long as it does not contain ammonia. Failzero/UCT Coating recommends no ammonia based cleaning solutions due to the NiB coating.
Q: This bcg fits into a standard ar15 upper?
A: Yes this carrier will drop in any mil-spec standard AR-15 Upper.
Q: I'm building up a ASA side charging upper. Would there be a problem with me have the small notch cut into the bcg for the charging handle?
A: There shouldn't be, but we recommend having a gunsmith with proper tooling machine it unless you have the proper tooling. Any modifications to bolt carrier voids all manufacturing warranty, though.
Q: So the buffer has to be taken off when taking out the firing pin and bolt?
A: No, we assemble them and disassemble them with the buffers in. Just put bolt assembly in as normal, then cam pin, then put the firing pin in between the carrier's long slits into the bolt assembly, then the firing pin retaining pin. We've never have had to remove the buffer to get the small parts assembled or disassembled.