Airsoft SIG 55# Series m4 Buffer Tube Adapter

thingiverse

This is an adapter that replaces the stock fragile folding stock on airsoft Sig 55# replicas. The adapter allows you to attach a standard AEG m4 buffer tube, which is held via a bolt that threads into the gearbox spring guide. With the adapter you loose the folding function, but it is much more durable and rigid than the stock setup. Also with some creativity and modification, you could wire the battery so it fits into they stock, which would likely provide more space than the stock compartment in the handguard. Designed and tested on a JG brand Sig 550, but it should fit other models and possibly other brands.