Colt factory magazine block from early AR-15 rifle

[browningautorifle]

That was done so the FA kits wouldn't work with the also new hammers...with the notch at the top. With the bottom carrier they would catch and cause a stoppage.

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[Lee Enfield]

That was done so the FA kits wouldn't work with the also new hammers...with the notch at the top. With the bottom carrier they would catch and cause a stoppage.

http://www.quarterbore.com/nfa/lightninglink.html

Which resulted in the "lightning link"...

[browningautorifle]

Which resulted in the "lightning link"

Yes, another method. I just use ex FA parts, converted except an SA selector. They all seem to run better. Leave the bolt alone...