Richard_w

Thanks for the further advice Mark. What technique do you use to polish the chambers? In hindsight, .223 would gave been a better choice for the first product, I agree. .308 is popular for pest control in Australia, particularly feral pigs. This is one of our main markets. Looking at some other areas to reduce friction in the action- the bolt face for example. May try a teflon coating here as well.

Thanks very much for that information Mark, I was hoping you would get in touch. Nothing like real world experience and knowledge. I am in Tasmania, most of the work is happening in Victoria though. What are your thoughts around chamber fluting? I believe the pump-action Troy PAR AR type rifles are fluted. And the POF ReVolt looks to have the their new fluted chamber neck design. Have you tried the ReVolt? Does the fluted chamber neck seem to have any advantage? Yes, there is not much we can do with the existing, nitrided, barrels, we will have to change the specification. Do you hand-polish your chambers after the barrels are supplied, or will some barrel manufacturers do that if you specify it?

All, I am working with an Australian manufacturer of a new manual AR10 type .308 rifle. We are having trouble with hard extraction. My feeling is that chamber smoothness is going to be one of the main issues. Others say the headspace is too tight- we are at the lower end of the SAAMI .308 headspace spec. The barrels are also nitrided, and I am wondering if this has an effect om either chamber dimension, or roughness, as well. I figured that shooters in the UK would have the most experience in such platforms. So I would be very interested to hear from anyone with experience building or chambering barrels on straight pull AR type rifles- particularly in the larger cartridges like .308.