Protek Pulse HPA Adapter for Glock / AAP-01 / US Adapter Features: HPA adapter in M4 version for Glock / AAP-01 / WE magazine Included PULSE is an ergonomic HPA magazine adapter. A bbs retention system is also present The M4 version of the PULSE adapter is based on the EPM1-S magazine (compatible with other brands) Compatible with most magwells on the market Guaranteed without any misfeed and no air leak. Ultra easy and simple assembly Product Specifications: Color: Black Material: High quality Polymer Compatibility: Adaptable with M4 magazines and MP5 magazines Manufacturer: Protek