The Dorin Technologies P90/PS90 maritime upper receiver stainless spring set is the perfect upgrade to your factory receiver or Effen 90 custom build. Each MIL-Spec spring is coiled from 17-7 stainless steel and heat treated for unparalleled durability and weather resistance. Each set also comes with a thin 15mm wrench for easy barrel installation. Tested for dependability and reliability under a variety of conditions, both with and without a suppressor and on full auto.
Includes the following parts:
- PS90 Stainless Barrel Support Lock Spring
- PS90 Stainless Barrel Return Spring
- PS90 Stainless Cocking Handle Return Spring
- 15mm thin wrench for barrel installation