Geissele short stroking????

**georgeib** · 10-01-21, 10:18

Originally Posted by Jamessdp115

The Geissele replaced the REBCG due to the some tolerance stacking issue between the BCG and the upper. They are shipping my baby “G” back today.

Good news. Let us know how it functions.

**Jamessdp115** · 10-01-21, 10:22

So why would they stacking together??

**sidewaysil80** · 10-01-21, 11:16

Originally Posted by Jamessdp115

So why would they stacking together??

Google tolerance stacking.

**Jamessdp115** · 10-01-21, 11:30

Great…more homework

**Disciple** · 10-01-21, 11:31

I tend to think "tolerance stacking" is used as an excuse for out-of-spec parts, since according to lysander properly specified and manufactured parts prevent it.

Originally Posted by lysander

If the design is properly toleranced on the drawings (and the M16 is), and the parts made to the tolerances specified, then stacking of tolerance will have no effect on operation. The only time "tolerance stacking" causes problems is if the tolerance are not designed correctly, or the parts are not made correctly.

That's the whole point of interchangeability. A rifle made from parts all at one end of the tolerance band should work just as well as ones made at nominal, or a random mix.