BudsGunShop.com - construction material

Hi Gary, They're both Steel. Frame and Slide Specifications and Features:
Colt Government 1911 A1 Semi Automatic Handgun 5170304
.22 Long Rifle
5" Barrel
1:13-3/4" Twist Rate
6 Groove Rifling
12 Round Magazine Capacity
Muzzle Thread Metric 8x.75mm
Removable and drift adjustable front sight
Drift adjustable rear sight
Internal extractor + Pinned ejector
Manual Thumb Safety
Grip Safety
Disconnector
Overall Length 8.6"
Overall Weight 2.25 Lbs
Matte Black

They are a Zinc alloy a full steel 1911 slide would be to heavy to function with 22lr from the review "While some shooters may complain about the use of zinc alloy in the frames, Walther has stated that this is a sophisticated zinc alloy that they selected for its durability, and therefore, they do not anticipate any issues with the frames as a result. I do not see this as an issue with this otherwise-robust .22LR."link thefirearmblog.com/blog/2014/01/10/gun-review-coltwalther-government-1911a1-22lr/

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Both "Steel". (Walther Colt Government 1911 A1 Semi-automatic Handgun special features): - M8 x 0.75mm threaded muzzle - Authentic half-cock mechanism - All steel lock work - Fully functioning thumb and grip safeties - Rear slide serrations - Single action 5.5 lb. trigger. - (Specs): - Caliber: .22LR - Action: Semi-automatic - Capacity: 12 - Barrel length: 5" - Frame: Steel - Slide: Steel - Grips: Rubber - Sights: Drift-adjustable rear, removable, drift-adjustable front - Overall length: 8.6" - Overall weight: 2.25 lbs.

Frame and Slide are both "Steel" Gary.