[M45A1 1911 KWC Railgun]

https://jdairsoft.net/kwc-airsoft-blackwater-bw1911-r2-16rd-co2-blowback-pistol-magazine

 

Lots of places have them in stock. A very common pistol.

[HPA WE GBBR P90]

ha gaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyyy 😆

[WE eu series glock 17 gen 4]

That's a gen 3, just letting you know

[120rd Advanced Polymer Mid-Cap AR-15/M4 Magazine]

https://www.taiwangun.com/en/magazines/box-of-5-5x-120rd-advanced-polymer-mid-cap-ar-15-m4-magazine-translucent-kublai?from=listing&campaign-id=19

 

Sorry m8, but these kinds of mags go for less than £6 per mag as new condition.

[KJW KC-02]

An NPAS is super easy and cheap to install.