Set Screw Gas Block Internal Deflection

AR/M4 AR Technical Discussion
21

Very interesting and I have wondered about this, especially at the theoretical level, since actual observation has been: no effect.

.00001 deflection, I would say, is less effect than the dif between having corn flakes vs/ biscuits & gravy for breakfast before going shooting :slight_smile: .

Which is not to say I think set-screwed gas block are OK. Far as Iā€™m concerned the setscrews are for holding it in place while I drill for a cross pin.

I agree about tapered pins-- if an 8-32 gives .00001 deflection, a tapered pin will give much less, like less-to-immeasurable. Probably part of the reason they ere selected for the task.

Fascinating study, good job!

22

Thanks op! How bout 10-32 set screw at 50in/lbs in the extream case on .625 gas block journal?

23

Thanks. I appreciate you running these numbers.

Joe Mamma

24

Nice work OP.

Does a modeled ten millionth of inch translate to anything physically measurable?

You could probably sway a measurement that small by breathing on the gas block. How would heat from firing, peak and residual, affect deflection? How about heat treating or chrome lining?

25

This is excellent info. Thanks for sharing!

26

How about the effects of a clamp on block?

27

Definitely curiots about a clamping blockā€¦but with all the forces distributed around the outsideā€¦I doubt youā€™d seen any internal deflection