07-02-2019, 11:55 PM
who makes your barrel? the biggest thing is that your bolt face depth needs to match what the barrel was cut for (pardon the dangling preposition).
yes, the inner diameter is larger as LtDan writes, the ejector is clear of the outer rim-face whereas the 223/556, well that ejector cuts into the outer rim-face-steel.
2 differences in Grendel bolts which can come into play. first is the face depth which hopefully should be 0.136 +/- 0.001 (some bolts, so-called type 1's, have the 0.124 or 5 depth). second is the bolt overall length which a real type 2 bolt is 0.011 longer than the 223/556 bolt. The normal 556 bolt is IIRC 2.800" long. The real Grendel with a 0.136 face depth needs to be 2.810-2.811" (again give or take a thou) from the front edge of the bolt rim-face to the end of the tail.
One important item: Toolcraft at one time made the shorter bolt (556 length or 2.800) and paired it with a shorter firing pin (not 556 std length) and a 0.136 face depth... if you have that combo of bolt/firing pin then keep them together and they will work fine in a chamber set for a 0.136 face depth. It's far better to have the std 556 pin and the longer-tail grendel bolt IMO. I think Toolcraft is now doing the (correct) bolt length and std firing pin but it's a good idea to measure yours and verify.
here's a thread that has some good info in it:
http://www.65grendel.com/forum/archive/i...18437.html
also, in the bolt face infographic thread - this section of forum - you will see how Bill A beefed up the extractor to handle the Grr case vice just using a 556 extractor.
yes, the inner diameter is larger as LtDan writes, the ejector is clear of the outer rim-face whereas the 223/556, well that ejector cuts into the outer rim-face-steel.
2 differences in Grendel bolts which can come into play. first is the face depth which hopefully should be 0.136 +/- 0.001 (some bolts, so-called type 1's, have the 0.124 or 5 depth). second is the bolt overall length which a real type 2 bolt is 0.011 longer than the 223/556 bolt. The normal 556 bolt is IIRC 2.800" long. The real Grendel with a 0.136 face depth needs to be 2.810-2.811" (again give or take a thou) from the front edge of the bolt rim-face to the end of the tail.
One important item: Toolcraft at one time made the shorter bolt (556 length or 2.800) and paired it with a shorter firing pin (not 556 std length) and a 0.136 face depth... if you have that combo of bolt/firing pin then keep them together and they will work fine in a chamber set for a 0.136 face depth. It's far better to have the std 556 pin and the longer-tail grendel bolt IMO. I think Toolcraft is now doing the (correct) bolt length and std firing pin but it's a good idea to measure yours and verify.
here's a thread that has some good info in it:
http://www.65grendel.com/forum/archive/i...18437.html
also, in the bolt face infographic thread - this section of forum - you will see how Bill A beefed up the extractor to handle the Grr case vice just using a 556 extractor.
"Down the floor, out the door, Go Brandon Go!!!!!"