Thompson Recoil, Bolt Velocity, And Ejection Distance

[reconbob]

Long story short - the higher the rate of fire, the faster the bolt velocity.

The faster the bolt moves one would assume the farther the empty case is

ejected from the gun. Has anyone noticed this? Does a M1921 throw the

cases farther than an M1A1? Next time you have the opportunity to notice

this let me know. maybe you already know if you put down a tarp to

retrieve brass for reloading.

 

Bob

Edited September 5, 2010 by reconbob

[TSMGguy]

It's not a scientific test by any means, but my M1 has a slightly slower rate of fire than the M1928A1. Cases from the M1 end up a little closer, but not by much. Just a few feet in both instances.

[PK.]

The Faster cyclic rate of the 1921 model does not necessarily imply significantly increased rearward bolt velocity if the Bliss lock is doing its job. The heavier recoil spring will return the bolt faster and thus is the greater contributor in my opinion.

 

Ejection distance from 1921’s and 1928’s has been, on average, about the same in my experience. Well with the variance you see from gun to gun.