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I think he's worried about point of impact changing when you remove and reattach barrel since the optics are attached to receiver and not barrel itself. Sent from my E6910 using Tapatalk
If you tighten the magazine cap that locks the barrel on firmly, it should shoot the same. These guns lock together with consistency, I have never had my poa change when I removed the barrel. Good luck...
I mark the cap and barrel with a sharpie so I can tighten the cap to the same spot as when I took it off. Sent from my iPhone using Tapatalk Pro