Ruger PC9 M-LOK Problem

[Paul49]

Got a Streamlight flashlight with a tape switch that mounts on a 3” segment of M-LOK rail. Installed the light on the right side (3 o’clock) and put the tape switch on the top (12 o’clock) so I could activate it with my left thumb while holding the carbine.

 

Went to the range to zero my MRO and got it just about dialed in when the section of rail with the tape switch rail came loose. Removed it and the flashlight, then shot again and was way off from the almost zero. Checked that the MRO was not loose. Went to put the section of the rail back in place and realized the M-LOK screws hit and slightly depressed the barrel. The barrel is not centered in the handguard.

 

The rail segment is from Bravo Company.

 

It appears the design of the PC9 doesn’t allow actual use of the top set of M-LOK slots.