Anyone else had FPS issues with GM MWS mags? 282fps….88fps…282fps…87fps….and on and on. Sometimes it would be 3-4 full power shots then a weak dribble. G&P and TM mags were fine.
Mag #4 had a sticky / stiff release valve, a quick spray of GT85 and some silicone grease and moving much better. Took the play out the knocker valve and it is much more consistent.
For £70 mags they are pretty shoddy and a PITA to load.