Charles Lehr

I replaced the end cap using a screw driver to pivot the end cap from inside the tube. Then I purchased a m4 end cap that fits over the m1 tube and drilled a hole thru m4 end caps nd tube and insert a drift pin. In the future, I remove the drift pin , then the m4 end cap comes out with the spring and follower. Very easy. I love the m1 super 90. Got the idea from looking at end of John browning 1897 Winchester shotgun.