T91 Complete Upper Assembly With Chrome Lined Barrel

[Jiro]

It was just the first couple mags I grabbed. They are OK but would not be a load out mag. If it was going down the HK maritime mags are my go to.

[DatChuan]

Just a side question sorted related to this, how heavy of the buffer weight should I use for 12.5 inch upper versions? And does the carbine falt wire buffer springs from the market work well with the 12.5 inch upper?

[apex]

Just a side question sorted related to this, how heavy of the buffer weight should I use for 12.5 inch upper versions? And does the carbine falt wire buffer springs from the market work well with the 12.5 inch upper?

At minimum the usual recommendation for piston uppers is an H2 (4.6oz), but mine will run a 3.0oz + standard spring no problem.
I don't know about flat springs though.