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I'm confused as to why you'd get a spacer when you can buy a thread adapter for your tube, OR a low profile 1/2x28 adapter from liberty.
what tube do you have?
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Hopefully this makes sense: My tube is an SDTA 1.5 Titanium tube. I have ordered an adapter from Ronin Pro to go in the SDTA tube, into which the booster will thread. This adapter will stay in the tube basically permanently and if I need to change pistons, or insert the spacer I'll just take the booster out.
If I use multiple thread adapters (rear end caps) I would need a specifically sized spacer for each one to go between whatever is at the back end of the silencer and the baffles. The way I'm planning to do it, I only have one spacer between the RP booster adapter and the baffles and I can just change pistons/spacers by unscrewing the booster.
Also I think I got an older style Liberty booster which appears shorter than the newer version. I'm trying to keep the OAL down. The Liberty fixed barrel adapter appears to be pretty long and is a lot more expensive than a spacer.