Your wrong. The XCR is capable of 100mm groups (with optics, 150mm without) at 100m and will fire 800 rounds before a single stoppage. Battle standards criteria. There is also something about ease of maintenance, but I don't feel like looking for it in my paperwork. Suffice it to say the XCR is capable of the to, considering it has 5 parts field stripped.
Further more, every single screw on that gun is torqued as such; hand tight plus 1/4 turn (except the barrel screw and another one, I can't remember which, I'd have to check. They have torque poundage) yes the barrel is retained by a screw, BUT it is secured by the bolt and head space (weapon won't fire if the bolt isn't seated in the barrel extension). So retaining method is immaterial. Barrel is an aftermarket barrel to adapt to our laws. The chamber is 556 even though stamped 223 for export.
Are you in the military?
I wish that a M-16A1 that Uncle Sam gave me when I was 19 years old would have spit out 800 rounds with out a jam! 800 is pretty darn good, and I bet the rifle is not at fault.
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