08-27-2018, 02:30 PM
Toolcraft bolt carrier is a standard carrier, it can be interchanged. I personally like the NiB ones myself. However, as A5 says, the bolt body and firing pin need to be used as a combo. They made their bolt equal length to a 556 bolt but cut the face depth (as it should be) to 0.136" depth... meaning their FP needed to be shorted by ~0.011. A standard grendel design bolt has a longer body so it can accept a standard FP yet still have the 0.136" face depth. And another caveat, ensure the barrel is headspaced for the 0.136 bolt face depth. Some what I could call -- less-standard -- Grrr barrels have a head space for 0.125 bolt face depth... the 0.136 style (aka "mk136" in BFT's lingo) is superior, again IMO. If that bbl has been successfully shot with no brass casing issues, then the mate-up is probably ok, but I would definitely ask the seller... caveat emptor still applies!!
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