Springman Posted September 7, 2019 Report Share Posted September 7, 2019 I was wondering who made these uppers for the Mac 10 45 acp. I picked up this early Powder Springs M 10 and this was part of the package, Thanks for any info about the upper. It functions great and gives you a nice grip on the forward end. Link to comment Share on other sites More sharing options...
timkel Posted September 8, 2019 Report Share Posted September 8, 2019 (edited) The upper was most likely made by RPB mfg. The lower is a preauction PS. The bolt is early. The take down pin is a type B original. All good to go. Edited September 9, 2019 by timkel Link to comment Share on other sites More sharing options...
JimB Posted September 9, 2019 Report Share Posted September 9, 2019 The slotted shroud carbine uppers set up for attaching the M3 Carbine flash hider are generally pre RPB look around online and see what you can find on the RPB SACs, Semi Auto Carbinesthere were around a total of 200 made, the lowers have a SAC pre fixed SAC serial numbersome have welded in place fixed stocks, others push button release. Pretty sure the run was in either 81' or 82' They are found in various configurationsmy opinion is that some Carbine upper such as yours were made up from leftover Powder Springs bitsthe PS carbines incorporated a Williams ramp base with a 3/8" dovetail with no receiver mounted front sightA friend has an RPB SAC new in the boxhis has a holed shroud, completely different from the slotted pattern. No ability to fit up the M3 FS either and a hood front sight in .45the 9mms were again, well different in my experience My best guess is yours is early RPB as the sight is on the upper but it's still slotted, M3 FS with the old school wood forend Link to comment Share on other sites More sharing options...
Springman Posted September 14, 2019 Author Report Share Posted September 14, 2019 Thanks for the info. Link to comment Share on other sites More sharing options...
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