Daveoc33

If you've switched co2 bulb brands you can get that issue. Different brands of bulb can have slightly different shapes on the top if the bulb. Some are tapered and some are flat. The seal in the mag can bed in to one type and when you give it a different type it no longer seals properly. You can buy seal replacement kits. Assuming this is a kwc mag you could try https://ebog-designs.co.uk/collections/cybergun-kwc-1911-co2/products/ebog-deisgns-cybergun-kwc-1911-co2-co2-bulb-piercing-valve-replacement-seal (which I'm guessing are home made) or you can get official replacement seal kits for more. Best of luck with this!

I had a similar issue on a stark arms g18c (I think vfc oem) in semi only where the slide would catch the triangle shaped part of the trigger bar that runs along the right hand part of the slide. When I pushed this part down into the lower receiver it felt quite grindy so the lack of smoothness was making it catch the slide. I completely disassembled the lower but couldn't find a positive point of failure. The only solution I had was to lubricate and bed in this trigger bar piece until it was smoother and now it cyles fine. Mine was a boneyard buy rather than new though. Good luck with this!

+1 for friction on the slide. Or it could be a problem with the valve knocker - perhaps not resetting properly. If it's flapping around then the sping has got loose.

Surplusstore are doing a tan Ares AS03 for £125. They've been like this for a while now, but I noticed the voucher code asforum5css gives you an extra 5% off. So with £4.99 delivery it's £123.49 all in. Gunfire have these on sale at £105 but with delivery and vat/charges etc this still comes out cheaper I think. It looks like there is only 1 tan one left and then they're all gone as I can't add 2 of these to my basket. https://www.surplusstore.co.uk/ares-amoeba-striker-as03-tan.html

Targetszone are doing the arp556 at £200 and a firehawk for £100. A few other deals on this page too. https://www.targetszone.co.uk/special-offers-7-c.asp