How would you explain an A Series which is, by all visual indications actually a B Series?
The owner clams his rifle in an AR-10(T) Navy Carbine
There is no (T) marking on the receiver, and I do not know what the Navy has to do with it. Could this have been part of a special production run for the Navy?
AR-10 A4 US 5XXXX (A series SNs are said to begin with an A, for example A000001)
It has an early fiberglass Handguard with the fluted ring at the rear and a SS Barrel and Muzzle Brake (both are magnetic) with three angled slots on each side. Is this an aftermarket Brake?
There is no Forward Assist
There is no vertical recessed portion on the left side of the magazine well.
The angle at the bottom of the Mag well seems to be less than that shown in images of A Series Lowers.
It has B Series Mag Well Cuts as shown in an ArmaLite video.
The Bolt Stop is wide, as in B Series.
The Magazine Catch boss appears square as B Series (Not rounded at end).
An ArmaLite agent told the owner that he needed to purchase a special Bolt Stop if he wanted to use their new GEN II Magazines.
New GEN II Magazines fit and lock in. Early ArmaLite waffle magazines do not. Nor do SR-25 Magazines. I haven’t been able to test fire the rifle to check function with these new Magazines.
This new Bolt Stop is narrower than the existing Bolt Stop which appears to be for a B Series rifle. According to the paperwork it is an AR-10 Bolt Stop Replacement Kit PN: EA6075 $18.75. (This is engraved AR-10A, which doesn’t seem right). The original is wider, and looks like one for the B Series.
