Colt factory five round magazine block

[BEAR]

In 1971 I purchased a Colt SP1 (1st kid on the block to have one) and the two magazine that came with it had those blocks in them. First thing I did was pull them out and restore the twenty-round capacity. Lost or threw away the blocks. Later magazine blocks were riveted in place.
My SP1 also came with an original Edgewater buffer. Replaced it with a newer one in 73. Saw the price of an original Edgewater last year and remembered the old adage: If hindsight were foresight!

BEAR