Serial number is normal. There was a run of M10 SAP pistols that had the letter “A” at the end of the SN. My buddy (a prominent and very knowledgeable MAC collector) chased one down on GB a while back, thinking the “A” possibly had some kind of significance, because it had one of the stamped laminated prototype triggers installed in it. Long story short, he got the gun and opened it up and the only difference was that stamped trigger. I have since seen the stamped laminate leftover MAC prototype trigger installed in a couple of other factory RPB M10 SAP guns. It was just luck of the draw which guns ended up with them apparently and the “A” likely had nothing to do with it, but the shorter number with the “A” at the end of it is legit. Not all of them had the year prefix. I think these “A” numbers are somewhat earlier 79-80 gunsthat screw is highly suspicious
Get a pic of the inside
Open bolt Semi's have NO Hole where them screws are......Theres an internal block welded in "in" that area.
That also has provisions for the stock .....Hit and miss on that.
I've seen them both ways.
Serial Number is way off base for a legit Open Bolt Semi imho
@MitchWerbellsGhost87
would know as well as a few others here
IF the ser. # matched pre 82
&
IF those holes were welded shut
&
if you got clear pics of internal sear area that were as was pre 82
It wopuld still be a maybe for a heavily discounted price
A legit Open Bolt semi in any cal is hovering around 2K +-