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I've playing with Zenith Z5RS and Z5P SBRs and I'm climbing up bullet weights until I arrive at a subsonic load with an Octane 45 HD/3 lug can. I'm up to 135gr. When do I need to start worrying about locking pieces?

Also, I've outfitted a SF Ryder 9Ti with a fixed barrel spacer and the 1/2X28 piston which I was going to try to throw in the MP5 mix. The issue is that the can bottoms out (the piston technically) on the muzzle vs. the barrel shoulder. Is this going to be an issue? Thanks.
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