TM g17 GBB custom please read

****Please read advert **** Here I have my custom TM G17 gbb List of the custom parts as follows 1. Stippled lower frame with trades. 2. Cow cow 14 mm nozzle 3. Guarder lightweight blowback housing 4. agency arms Custom Trigger and mag release. 5. Guarder metal outer threaded barrel. 6. New hammer spring and sear. All the other parts are stock TM The pistol has some wear to the slide quite a few scratches all over it still functional and has no cracks or breaks in it. Has recently had the new sear and hammer spring put in at UK airsoft. I have also just installed the brand new bbu and enhanced nozzle. The main issue with the gun is that after the mag is in it fires one or two shots then either the slide sticks or it vents completely I have already paid £35 to get it serviced and repaired but still having this issue so off to someone who has the skill and time needs a good project gun or great parts for an existing Glock. The parts alone cost a good amount so looking for £60 all in posted