Just throw on a sig brace and call it a day. Its not meant to be a ruling. I figured I was going to get trapped parts swapping no matter what, resulting in a half-breed gun either way so I opted for the easier (and debatably cheaper) road of staying with the 556.
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Copyright © 1996-2020 AR15.COM LLC. What did you do about compliance parts? Works with SIG 550, 551, 552, 553, and SIG Sauer 556. I'm in for the answer to this also.

As far as they have been informed, any pistol can be registered to be and NFA SBR. Membership is free and we welcome all types of shooters, whether you're a novice or a pro. Even with the stock extended, the 553 is shorter than my 10.5" AR with the stock collapsed. Please enter a valid zip code. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Also added a Swiss Army sling and an Eotech 512. Talked with an ATF agent on Friday. Was in the shop for background check info.


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  • World renowned and the choice for many of the premier global military, law enforcement and commercial users. If said 553 (pistol) is converted-ie..buttstock, You have an NFA SBR item, which if I  remember correctly, is exempt from 922r due to it being class3/NFA item. [gravityform id=1 title=false description=false tabindex=0],