mike12345 18 Posted August 27, 2011 Report Share Posted August 27, 2011 Trunion or receiver? There are some marked on one, some marked on the other. Maybe it's a better option to just mark the barrel? Quote Link to post Share on other sites
kevin.rose0@gmail.com 62 Posted August 27, 2011 Report Share Posted August 27, 2011 "Certain additional information must also be conspicuously placed on the frame, receiver, or barrel of the firearm by engraving, casting, stamping (impressing), that is, they must be placed in such a manner that they are wholly unobstructed from plain view. For firearms manufactured on or after January 30, 2002, this information must be to a minimum depth of .003 inch" I don't think the trunnion is acceptable. Quote Link to post Share on other sites
Matthew Hopkins 1,065 Posted August 27, 2011 Report Share Posted August 27, 2011 (edited) the only marking I ever see on the trunion, foreign made AKs, is the serial number. the manufaturer names are always marked on the receiver. there is no room on the trunion to even put a manufatuer name. unless you are talking about a arsenal mark on the trunion, that really isn't a manufaturer name, just a logo. Edited August 27, 2011 by Matthew Hopkins Quote Link to post Share on other sites
Shandlanos 1,470 Posted August 27, 2011 Report Share Posted August 27, 2011 Some permanently attached parts are considered valid, perhaps (guessing here) even part of the receiver. The front trunnion might be considered part of the receiver, hence the legality of placing the serial there instead of the receiver itself. Similarly, the serial number of a Glock pistol (or any of several other pistols) is not actually on the frame, but on a piece of metal permanently attached to the frame. When in doubt, write for an opinion letter. Quote Link to post Share on other sites
RDSWriter 5 Posted September 5, 2011 Report Share Posted September 5, 2011 (edited) There are somem AK type firearms with the information on the trunion.. My Saiga 12 has the serial number on one side and the model, importer, city and state on the other side of the trunion. Granted... Those are very big trunions. Regardless, I do have a letter from the Tech Branch regarding the trunion. Once riveted to the sheet metal receiver, it becomes part of the receiver (basically considered as permanent as the metal strips in polymer framed firearms). If the trunion contains the original manufacturer's serial number, then it cannot ever be replaced because doing so would remove the original serial number. If not serial numbered or if it does not contain original required NFA marks,then it can be replaced. Edited September 5, 2011 by RDSWriter Quote Link to post Share on other sites
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