Quoted: We've shot a fair amount of 6.8 mm and have not seen any broken bolts in any of our weapons. |
OK, whats a "fair" amount & what pressure level was it loaded too? What kind of bolt is in it? To really answer this question it needs to have about 5 70,000 PSI proof loads fired in it & then be magnafluxed. Then 10,000 rds of 55,000 PSI loads fired in it. Now, when we have several thousand rifles that have done so, we can be confident in the bolts. Untill then we just have too make SWAGs based on the available evidence too date. My guess is its borderline acceptable. Some 5.56 bolts fail when subjected too the above treatment. This bolt is a weakened 5.56 bolt. I would expect more of them too fail than 5.56 bolts. An AR has its strong & weak points. The bolt is not a strong point of this design. It was originally designed for the triple duece. I'm quite sure its plenty strong enough for the 222. Then we crammed the slightly longer & higher pressure 5.56 into it & it still lives good enough. Then we crammed the 7.62X39 & PPC cartridges into it & started having problems. The boltface on a 6.8 is between 5.56 & 7.62X39. I'm sure it'll live at a certain pressure & for a certain service life. I just don't know what either of those points are & at this time I don't think anybody else does either. M9