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Not certain what the correct hammer should be in this carbine as I have had it a number of years. The hammer in this carbine now is a late I H
Barrel is IBM CORP front sight SN
slide is heart cut UN Flat bolt blued N14 trigger housing N8 push safety NS
Mag catch MN - might be incorrect ? sear LN Rear sight S
single rivet handguard TN recoil plate LN
stock is hi-wood TRIMBLE TN in oval cut cartouche is NPM over FJA next to crossed cannon
IBM used only type 3 hammers
marked WMB-GMB-AMB
Bolt should be round
March/April of 44. The round bolt (type III) came in around serial number:
Inland 5 mil
Win 5.6 mil
Underwood 6.1 mil
Rock 4.6 mil
Qhmc 4.65 mil
SG 5.84 mil
Npm 4.4 mil
Ibm 3.9 mil
IP,S'G' and Stan Pro- no use
Flat Bolt is correct for NPM 4.24, MN mag catch is correct. Hammer would be NH
What type of hammer?
3. HN. Welcome. (I win)
Thank you for the data. Forgot to list the front band is the early Type 1 with three small tack welds and unmarked, the swivel is stamped U I