How to Modify/Fit the Tapco magazines to the G3/1 Adapter
How to Modify/Fit the Tapco magazines to the G5 Adapter
Cut the duckbill off leaving 10mm of "tab". Make a straight cut from top to bottom leaving all the tabs in place. Do NOT cut into the mag body as above. This is an early mag conversion. The finished tab will be between 5-7.5mm long. That’s pretty short. Start at 10mm and work your way down with a file or utility knife.
Cut the rib out between the 2nd and 3rd tab.
Cut off the remaining tabs so your mag looks like the one above. This is an early mag mod, so, do NOT cut into the body of the mag. Cut flush against the mag body .Cut a angle of approximately 45 degrees from the top of the mag to the second tab so the two angles (mag tab and adapter piston) can oppose each other. Physics 101 says that 2 oppositely opposing angles will push each other equally as pressure is applied. gaio
Clean up any "slag" on the tabs and body with a Dremel, file, Utility knife, etc. Shape the tabs by rounding the edges slightly. You should angle the TOP tab in towards toward the mag body at a 45ish degree angle. This helps with the lock process.
Cut a 45 degree angle on the front of the follower so that it stops just above the front mag lip. Be careful not to cut to deep into the follower. This allows the mag to rotate cleanly out of the mag well when the mag is empty.