04-24-2019, 09:04 PM
A standard AR bolt is 2.800 long with a .125" bolt face recess depth. Since the grendels use a .136" bolt face recess depth, going to a .010 longer bolt (2.810" length) allows use of a standard AR15 firing pin.
Some earlier Toolcraft bolts were the standard 2.800" length and had custom .010" short firing pins as a result. While this works great, it is undesirable because it makes procurement of a replacement firing pin difficult.
The latest Toolcraft bolts, mine included, have been measuring the preferred 2.810".
Some earlier Toolcraft bolts were the standard 2.800" length and had custom .010" short firing pins as a result. While this works great, it is undesirable because it makes procurement of a replacement firing pin difficult.
The latest Toolcraft bolts, mine included, have been measuring the preferred 2.810".