May 14, 2018
$32.99 M4 / AR-15 UPPER RECEIVER PARTS KIT
The easiest way to build rifles out of your receivers. This complete kit is much lower in total cost than buying the parts one at a time. Kit includes: forward assist assembly, ejection port cover assembly, flash hider crush washer, peel washer, ejection hinge pin snap ring, forward assist rear base spring pin, forward assist spring, ejection port cover pin and ejection port cover spring.
https://www.cactustactical.com/M4-AR-15-UPPER-RECEIVER-PARTS-KIT_p_267.html