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AR-15 Enhanced Trigger Guard
by HaveBlue, published
A trigger guard for AR-15 style trigger housings that provides a larger opening similar to that of a popular aftermarket part.
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I had originally wanted to have a Magpul(tm) style trigger guard on my Reinforced AR-15 Lower Receiver, but was stymied by not actually having one to reference (plus wanting to leave the bottom as flat as possible to improve adhesion with the support base to minimize warp). I finally got around to purchasing such a trigger guard, and quite like the unit.
The stock AR-15 trigger guard has a spring loaded pin on the forward end and is secured with a roll pin on the rear. The idea is that for Arctic conditions, soldiers could use the tip of a bullet to unlatch the trigger guard to allow a gloved trigger finger unhindered access to the trigger. A similar system is used on the original F1 version of the French FAMAS bullpup rifle (though the trigger guard swivels out of the way in a different axis).
Enlarged trigger guards allow a gloved finger better access to the trigger, but at least on the AR-15, this more importantly allows a more natural balance point for the gun's weight to rest on your middle finger during a magazine reload. In short, it's a very simple upgrade to a rifle that improves the feel of the gun. Why pay $9 plus shipping for a tiny bit of plastic when you can just print one for pennies? It's not a perfect clone of the original, but it's very close! The main photo shows my printed version installed with the original Magpul(tm) unit below it.
I also have a secondary version that doesn't require roll pins (I have an aversion to roll pins). Instead, it swivels in on the front peg and then snaps into place via two beveled rear studs. Not as secure as pinning the guard in place, but certainly more expedient. Secondary photo shows this version installed.
Also uploaded is my original SolidWorks 2010 file - modify to your heart's content.