Line SI Promaster. The Promaster was an ealry two-tube blow-back from the same company that manufactured Bushmaster pump guns, and features compatible barrels. Early Promasters were very flawed. This is a second generation model and my second version, purchased around '91-'92. Here, it features a crown point barrel, although I have a plethora of no-name barrels for the Promasters/Bushmasters. No, It's not a Spyder clone. The Spyder is the clone, having appeared several years after the Promaster, even wearing the same colors as this model. The Spyder is such a good clone that many internal parts are compatible between the guns. Promaster page.