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M1 Carbine Blank Adapter Aperture Sizes

Initial information compiled by Dave from Gopher Munition Works, edited and arranged by Chris Guska

M1 Carbine Blank Adapting FAQ
Blank Adapting the M1 Carbine

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BFA Type	Manufacturer	Size	Drill Size
1.) Military Surplus			(Functions)
Notes: With this adapter, since it is non-adjustable, it is indicated if it functions.  This adapter can be drilled and tapped for a set screw. This adapter will only fit on M1 carbines with milled front sights.	Atlantic Wall Blanks
	Blanksguys (Satterfield)
	Gopher Munitions Works Blanks
	Ketchum Blanks
	Swanson Blanks
	Norwegian Red Plastic		Yes
2.) Threaded Barrel Set Screw	Atlantic Wall Blanks	5/32	0.156
Notes: This is the true "Hollywood" in barrel type adapter, the OLD Norwegian red plastic blanks sometimes take 1/8 - 0.125 to cycle.	Blanksguys (Satterfield)	5/32	0.156
	Gopher Munitions Works Blanks	5/32	0.156
	Ketchum Blanks
	Norwegian Red Plastic	9/64	0.140
	Swanson Blanks