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1919A4 Build Tutorial 2
    This photo shows from the left, the pistol grip / backplate, feed cover
latch, top cover, trunnion and the feed cover on the bottom.
This is the barrel, barrel jacket, booster and booster lock ring
    From left to right the parts are the front cartridge guide
in .308, the feed pawl and spring and the right rear
cartridge stop. The retaining pin is on the bottom
Checking parts fit up:

After you have thoroughly cleaned the receiver parts check the fit with the side
plate. All the parts should fit together easily, remove any dirt or burrs that interfere.
Check the alignment of the parts and if it all fits together properly you are ready to
clamp up the receiver to drill the rivet holes.