Is there an easy way to check to see if the barrel is concentric? For suppressor use.
No easy way that I can think of per say…other than to send the barrel to ADCO and pay them $25 to do it for you.
I’m a little worried because it is a SIG 522, I’m not sure the quality control is priority one. I have to ask them if they will do a 522.
Could I use a plum-bob? Would that work?
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Before I paid to get it done, I would use calipers to measure the metal thickness from inside the bore to outside the barrel. Just take 5 or 6 measurements around the barrel to see if they all match, which would indicate it is concentric or close at least…
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I’m kinda liking the plum-Bob idea for a quick & dirty check. I’d use a monofilament line & check that the line just kisses the bore wall at the same time for both breach & muzzle around the entire circumference. Then I’d attach the suppressor & do the same test. If it passes the test cleanly I’d shoot it. Any doubt though & I’d pass it along to a professional.
Place appropriate pin gauge in barrel. Use dial indicator to check for run out
maybe use a wood lathe for turning furniture legs, or just a plain old metal lathe and check for balance issues and wobble, I would think a barrel not within tolerances would wobble like a fat woman wearin size 2 jeans… but this step is probably outside the means of most normal home garages.
I think the ADCO idea is the best… and can’t beat $25 for it just to be sure.
A barrel straightness gauge could check too.
Assemble supressor onto muzzle, drop strightness gauge through breach to muzzle.
If the gauge passes freely, then things align.
If the gauge sticks, the barrel is bent, the gas port has gaulling, or there’s misalignment of barrel and supressor.
This is presuming the supressor isn’t overly long as at least 1/3 the length of the gauge should be able to remain in the barrel, 1/2 would be better, while the other end protrudes from the supressor muzzle.
Otherwise it can potentially have some rattle room that could end up in a false reading.
This is how the M14 guys make sure that their flash suppressor are on straight…
The cheaper “gauge” for .30 cal is a #2 pencil. For .22 a 7/32" dowel should work.