this is what the CRL states
E-11 Blaster
For 501st approval:
Based on a real or replica Sterling sub-machine gun, scratch-built, or a modified commercial toy Stormtrooper blaster.
For level two certification (if applicable):
Folding stock (does not need to function).
A real or replica ammo counter - based off of a Hengstler counter - shall be present.
D-ring mounted on the rear.
Sterling based blasters have the correct M-38 or M-19 style scope.
Two power cylinders on the magazine housing.
Scratch-built or cast blasters shall have a total of 6 T-tracks on blaster (leaving the lowest row on the magazine housing side uncovered).
If using the Hasbro E11 toy blaster, it is modified to have the correct number of T-tracks (6 total), with a lower row of open vent holes on the magazine housing side.
This is accomplished by covering the pre-existing rows of holes with T-tracks, then grinding off the lower integrated T-track on the magazine housing side, and drilling a new row of holes in its place.
No ESB/ROTJ greeblies are allowed on the blaster.
For level three certification (if applicable):
Hasbro blasters are not allowed, even conversions.
what i do know is when you compare the size of the rubies to the Hyperfirm or the actual resin casts it is a bit smaller.