Another choice for the airsoft version of the SITES Spectre M4 as Echo1 USA announces that their Spectre RDP will be coming soon... "The Rapid Deploy Pistol (RDP) is the latest compact CQB weapon from Echo1. It features full-sized version 3 compatible internals in a custom gearbox that can be upgraded to anything you could imagine. The RDP makes an excellent primary or backup weapon due to its very compact size and is light enough you could even wield two RDPs.

Some Features of the RDP:

• Light Weight compact design
• Perfect as secondary
• Reinforced internals
• Mini or lipo battery"