Originally Posted by
Joe Mamma
I agree with Leuthas. It is definitely an LMT bolt.
In addition to the relief cut around the lugs, the holes for the ejector roll pin are different on each side. If you look very closely, you can see that the hole in the lower pic is chamfered, and the hole of the other side in the upper pic is not.
By the way, that roll pin goes in and out of only one side (the chamfered side). Also, that roll pin is shorter than many that are on the market. But it is the same length as a Colt uses. There are at least 2 different lengths of ejector roll pins that are commonly sold in the AR market. Colt and LMT (and probably many others) use the shorter ones.
I have seen both coiled and spilt ejector roll pins in LMT base ("standard") model bolts.
The sideways engraved "MP" and letters on the other side are the way LMT does theirs. You should know that sometimes the "MP" is flipped over. But it is always in that same area. Also, the area which says "Cl" can be other letters or just one letter. But the letter style (and size) on both sides is always the same as in your picture, and they are always engraved.
Your bolt also has an ejector spring "bleed hole" (you can see the coils of the installed ejector spring) just like real LMT bolts. Some AR bolts do not.
The machining on LMT bolts around the lugs and that end of the bolt is not always consistent (from bolt to bolt), and it is sloppy sometimes. So that shouldn't be a factor . . . but I always look anyway.
By the way, although many new LMT base model bolts are test fired by LMT, I have received some (direct from LMT) that were not.
I hope this helps. Let me know if you have any questions.
[edited to add:]
What do you mean by the following statement in your original post? Your ejector roll pin looks fine to me.
Joe Mamma