Warning

 

Close
Confirm Action

Are you sure you wish to do this?

Cancel Confirm
AR15.COM
AR Sponsor
6/8/2007 2:28:25 PM EDT
i saw an upper for sale that had a M on it back by the rear sight, it also had B MP on the barrel. i assume the barrel to be bushmaster, but what about the upper mark.
6/8/2007 2:44:30 PM EDT
[#1]
listing courtesy of Team Member "Willow_Drifter"

A (splintered) = Anchor Harvey Aluminum

AF = Alcoa Forge

C AF = Colt Alco Forge

C MB = Colt / Mueller Brass

Cardinal (stylized) = Cardinal Forge

CH = Colt Harvey Aluminum

Circle/Crosshairs w/"AR" = ArmaLite

CK = Colt / Kaiser Aluminum

CM = Colt / Martin Marietta

D (stylized) = Diemaco

DK = Diemaco / Kaiser Aluminum

E = Emco

EK = EMCO/Kaiser

E MB = EMCO/Mueller Brass

F keyhole = FNMI / Cerro Forge

FA = FNMI / Anchor Harvey

FK = FNMI / Kaiser Aluminum

FM = FN/Martin Marietta

FMB = FNMI / Mueller Brass

Keyhole = Cerro Forge

L = Lewis Machine & Tool

LK = LAR / Kaiser Aluminum

LM = LAR / Martin Marietta

M = Mueller Industries:  

PA = Capco / Anchor Harvey

PM = Capco / Martin Marietta
6/8/2007 2:49:41 PM EDT
[#2]
Upper forgings manufactured by Martin Marietta were marked "M" near the rear sight.
Doesn't tell you who machined the upper.
6/8/2007 3:33:11 PM EDT
[#3]
great info, thanks.
AR Sponsor