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For a feature packed full-size 1911, the Duty Series comes from the factory with a long list of enhancements and are available in several versions to fit the needs of shooters on duty or the range. Tisas Forged Foundation Construction – Forged Frame & Slide** Tisas Hammer Forged Barrel Colt® Series 70 Based Internals Lowered & Flared Ejection Port Multiple Finish Options* Trigger Guard Under Cut Forward and Rear Slide Cocking Serrations Flat Mainspring Housing Plastic Diamond Pattern Grips Novak® Style 3-Dot Sights Skeletonized Trigger & Hammer Ambidextrous Safety Extended Beavertail Grip Safety Available in 9MM or .45ACP* Tisas Premium Owners Kit (2 Magazines, Cleaning Kit, Lockable Rugged Case) Covered by 1-Year Warranty and the Tisas Lifetime Service Plan

Michael, several differences depending on the model. Kinda hard to give a detailed answer since like you said there's quite a few variations. For the most part it's just little differences like different sights, different finishes, some have upgraded triggers, some have a picatinny/accessories rail while some don't, but the actual core of the firearm is the same. Just depends if you want an accessories rail or upgraded sights/trigger. If you're looking at one or two just post again with the model numbers or upc numbers and can give a more detailed answer on the differences. Hope this helps.

Michael, TISAS does indeed have a wide variety of 1911's with varying trim levels. It is best to search each individually by UPC code to compare the features to make the best decision as to which meets your needs best. Cheers and stay safe!

I believe the differences are going to be like is it stainless steel or cerikote? Look at the new guns and depending on what they are made of or accessories.