My first AR was an SP-1 I picked-up for $350 in April 1983. If I recall, it had a five-digit serial number. Wasn't too long after that time was when the Picatinny uppers came out. I sure wanted one of those. I so badly wanted a rifle to which could be attached a scope that didn't require the user to have a neck like a giraffe to sight through the scope. Times changed and I began to earn more money. I eventually purchased a rail-top rifle. Then another. Then another. I'll stop at just those three, but I now own so many that some would say I have an obsessive compulsive disorder to either buy 'em or build 'em. Pleadin' the Fifth on that one...Hell of a deal. I got mine when I had a four digit serial number SP-101...cried when I had to sell it.
My early ones are not as nicely fitted-out as are my later ones, but all are configured differently. As I gathered more tools and developed a better assembly technique over the years, the end results became much more fine until what I now build are very nice rifles. Having all the correct tools makes assembly much easier, and considerably reduces the chances of damage to the lower. In all I have done for myself and for others, I have yet to break off even one of the trigger guard ears. Anybody who has knows the feeling of dread such an occurrence brings. Fortunately, Daniel Defense makes an integral pistol grip and trigger guard that mitigates such a blunder. Add to that, the grip angle is better suited for lengthy periods behind the trigger. Just a guess, but I'm thinking the angle is taken from that of the M1911 pistol. The pistol's grip angle is 18 degrees, which I have read is the optimum angle for both sighting ease and gripping comfort.
https://www.brownells.com/rifle-parts/grip-parts/pistol-grips/ar-15-pistol-grip-prod71443.aspx
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