The Hammer Spring for the Echo ARII Trigger is designed .223/5.56. The Caliber Conversion Hammer spring is an upgraded Hammer Spring to achieve consistency for shooting 7.62 x 39.
You should be able to shoot steel or brass case with your Echo ARII Trigger; both work great with the installation of the Caliber Conversion Hammer Spring.
Fostech, Inc. forged aluminum stripped upper receiver.
- MFG: Fostech, Inc.
- Type III Anodized Coating
- 100% USA Made ??
- Limited Lifetime Warranty
- Black Anodized finish
- Flat-Top with Picatinny rails
- Mil-Spec dimensions
This is a stripped upper receiver and does not include internal or external parts such as ejection door assembly, forward assist, bolt carrier group or charging handle.
Fostech 5.56 Strake Brake for AR-15. Available in Black Nitride, Stainless Steel and Titanium. The Strake Brake is a muzzle device designed to mitigate recoil and muzzle rise. Fostech’s line of AR-15 components is inspired by jet fighter aircraft and aviation. Holding true to this, in aviation, a strake is an aerodynamic surface generally mounted to the fuselage of an …
.22 LR CONVERSION KIT FOR THE AR-15 PLATFORM. Just swap this drop-in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR. Ships without a magazine. If you are purchasing this for use with the Echo Trigger, you will also need to purchase the Auto Sear Trip Kit. The Sear Trip …
Shave some more weight off your next build with the FosTech ultra-light castle nut.
This is a standard full-auto M16 cut bolt carrier. It is designed to function with the Echo AR-II and the Echo Sport.
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