Bolt Airsoft Lower Receiver for Bolt B4 Airsoft Electric Blow Back System Rifles (Color: Black)

"Ordered this lower as a replacement for the B-4 B.R.S.S M4.

Parts fit directly into the lower without issue and worked as intended.

The issue was when fitting the lower to the upper, the front body pin hole was out of alignment to the upper's pin hole and could not allow the pin to be inserted.

A 7mm drill bit was used on the upper's pin hole to enlarge it enough for a clear pass between the two while still being tightly locked together.

The hog ring on the stock front pin was removed given the tight fitment not allowing any room for the hog ring bulge, additionally the tip of the pin was given a slight bevel to ensure no scraping or catching when inserted.

Overall, the replacement was possible, but required modifications on a product that should have been a direct fit, so be warned...Q.C may not be the best for these.