Monday, June 22, 2015

Funny looking part

Anyone recognize the mainspring housing on the left in these?  Ostensibly both are 1911 parts, but I dunno...




A reader asked me and has asked other bloggers and fora.  Everyone is stumped.  So far.  There is no hole for a retaining pin and that slot is weird, obviously. 

2 comments:

Daniel Watters said...

I believe Auto-Ordnance used to inflict that on their mainspring housings. No one really knows why. However, some pistolsmiths have taken to drilling a small vent hole on the inside face of the mainspring housing to prevent a buildup of oil, grease, or any other fluid inside the housing from interfering with the compression of the mainspring and its cap.

B said...

I had an Argentine 1911-ish pistol that had a mainspring housing much like that, IIRC.