Registered by Sendra Corp, this M2 conversion unit includes a "W" marked operating rod, "7161838" selector switch, Inland forged steel trigger housing (modified to fit the selector and transfer bar), "7161837" sear plunger, and a round "A.I." bolt. The serial "21" is scribed into the transfer bar, selector and plunger, with the Sendra address and "M2" marking laser engraved into the transfer bar.

Manufactured c.1943-1944, this Saginaw SG receiver has been fitted out with the M2 conversion unit described in A, converting it into a selective fire carbine. Blade front and "I.R.CO." adjustable peep rear sights, with a "SAGINAW S.G." marked barrel and "SAGINAW SG" marked receiver, the latter also marked "SG" on the left side, "SI" type III bayonet lug, unmarked pushbutton safety and M2 magazine catch, metal upper handguard and a "HI" marked stock. One unmarked M2 magazine is included.