This is lips for airsoft 1911 greengas magazine which is tend to break down often.
Seems compatible with Hi-Capa / WE / Socom Gear / CQB Master / MEU models.
https://www.amazon.co.uk/We-Magazine-Feeding-Lip-Hi-Capa/dp/B00VV8ENRQ/
a bit pricey for a small piece of plastic :^)
Update 19.10.17:
After some testing i have updated stl - distance between lips now bigger so it can fit 6mm BB
1911_mag_lips_updated.stl | 176.1KB |