Tracer Under 34mil

[Stu000000]

Can anyone recommend any negative thread tracer units under 34 mil in diameter to fit under a krytac crb rail? 
 

Cheers! 

 

[L3wisD]

The Acetech lighter has a diameter of only 30mm. With a length of 101mm.

I used to use one all the time at the mall. It's really bright, doesn't skip any BBs and battery lasts a good old while:

https://www.acetk.com/products/5a2fcbeadcb23e784a000001

 

[strykerles]

I use this one inside an m4 handguard, 29mm across

https://www.patrolbase.co.uk/emg-noveske-sound-hog-tracer-unit?pv=11959