I have a used 16 I picked up a few weeks ago and I finally got around to shooting it today. Older model, was a safe queen and barely shot, I used a bore scope before I purchased it as I do with all used guns!I installled an ASR quick detach mount on it for my Specwar 556, ran it to the shoulder and loctited like I do with every other gun I own. 1st shot and I got a baffle strike... couldn't freaking believe it. Are the older models known for threads not being concentric??? I've never had this happen before and I'm sortof stumped. I checked the mount before I left with a wrench and it was tight before and after firing it. I also made sure I locked the can up right before I fired it as I do every single time I go to the range. Is this something Scars are known for? I'm thinking I'm going to chop it down to 14.5 now and have a ASR brake pinned and welded... Kind of disgusted though that something would happen with a gun like this> Any one have any thoughts...?