« Reply #25 on: April 08, 2013, 04:30:13 PM »
On some models, Colt has been doing that for years. My 1991-A1 Commander came with a plastic mainspring housing twenty years ago. I promptly swapped in a Smith & Alexander unit with the built-in mag guide...... I have thought of swapping the plastic one back to lighten it since I use it for CCW.
I did the same thing with all 3 of my Para .45s.

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