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Blowback Firearm Bolt Masses

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Maker Firearm Caliber Bolt Mass (g) Notes

Charter AR-7 .22LR 157.5


Marlin Model 60 .22LR 151.4
Ruger 10/22 .22LR 185 [1]
Ruger 10/22 .22 WMR 453.6 [2]
Cienar AR Conversion .22LR 147.8
German AK Trainer .22LR 184
Hi-Point C9 9mm 518 Slide
Hi-Point 995 .45 ACP 630 Slide
Tampereen Asepaja Oy Jatimatic 9mm 636.16 Recoils at 7 angle
Faxon AR9 9mm 417.2
CMMG AR9 9mm Radially Delayed Blowback
New Frontier AR9 9mm 400.4
Bechowiec BH Submachine Gun 9mm 685
Enfield STEN Mk2 S 9mm 628.992
Thompson M1 .45 ACP 788.48
Thompson M1A1 .45 ACP 815.36
IMI Uzi Full-Size 9mm 677.6
IMI Uzi Pistol 9mm 403.2

Orion's Hammer Theoretical 9mm 500


Orion's Hammer Theoretical 7.62x25 627.2
Orion's Hammer Theoretical 7.62x29 2000
Orion's Hammer Theoretical 7.62x51 5000

Note: "Most successful blowback firearms have bolt recoil velocities around 4m/s" [3]
[1] Also listed as 6.4, 6.5 oz, 194.5 grams including the handle

https://www.rimfirecentral.com/forums/showthread.php?t=459921#/

Ruger 22lr bolt and factory handle weighs approx 194.5 grams

Ruger 22lr bolt and heavy Mag Research 17hm2 handle weighs approx 240.1 grams

Ruger mag bolt and factory handle weighs approx 453.6 grams

Razor mag bolt and special handle weighs approx 223.3 grams

[2] I read that the 10/22 WMR bolt should be 5.5 oz heavier than the base bolt, so 11 oz. total, or 308 g.

[3] https://www.thehighroad.org/index.php?threads/blowback-timing.773310/

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