04-02-2013, 03:36 AM
That should work out for you, as long as the spring is a carbine spring and you're shooting 120-123gr. The worst I can see is that you would have to go to a lighter carbine buffer of 2.9oz, or open your gas port, but with your port diameter, I'm thinking she will run smoothly.
One reliability tip I will mention is to radius your ejector face. This seems to be helpful with the Grendel because the wider bolt face allows for case rims to come in at an angle that sometimes hangs up on the ejector face edge, especially a sharp ejector face, so a nice radius will allow smooth transition of the case head into the bolt face.
This is a common practice with hi-power shooters. Here's an unmodified 5.56 bolt. Notice the flat ejector face with a sharp edge to it:
![[Image: 2013-04-01222249_zps2b4f0846.jpg]](http://i1085.photobucket.com/albums/j422/LRRPF52/2013-04-01222249_zps2b4f0846.jpg)
Here's a modified ejector on one of my 6.5 Grendel bolts:
![[Image: 2013-04-01221743_zps8f017d09.jpg]](http://i1085.photobucket.com/albums/j422/LRRPF52/2013-04-01221743_zps8f017d09.jpg)
One reliability tip I will mention is to radius your ejector face. This seems to be helpful with the Grendel because the wider bolt face allows for case rims to come in at an angle that sometimes hangs up on the ejector face edge, especially a sharp ejector face, so a nice radius will allow smooth transition of the case head into the bolt face.
This is a common practice with hi-power shooters. Here's an unmodified 5.56 bolt. Notice the flat ejector face with a sharp edge to it:
Here's a modified ejector on one of my 6.5 Grendel bolts: