05-27-2015, 08:07 PM
Blackleaf40 Wrote:I have several Spartan side charging uppers that are similar to the Gibbz. I read some where that both are manufactured by the same people, but that has not been verified. I have one on a 300 Blackout pistol, and a re-upperered a bull barrel upper I had purchased, both had a snug, slight interference fit between the barrels and upper. Few taps of a hammer to seat the barrel. The barrel nut threaded on snug too. I really like the idea of the non-reciprocating side chargers. I just pulled the trigger on a few American Spirit Arms side chargers just because they have an ejection door. I thought that would be a good idea for the Grendel I'm building as a hunting rifle. I'd love to hear how the Gibbz works out for you
BL40, did you put a lapping tool to the receiver face?
I'm thinking of trying one out just to see how flat and square it is. I'll have to order a lapping tool, which I think I'm going to lap any other builds I do. I have a Vltor MUR forged upper and this same barrel wobbles around in the vltor like you wouldn't believe. So I want to lap that one at least. While I'm at it can do the Gibbz since I'm about to send the 24" barrel to PF for nitriding.