Jesus some people are absolute fucktards when it comes to defending their points. How about this Mr. 1911 fanboy. I'll use small words so you don't have to use your Websters Junior Dictionary too much.
First the 1911 weight...
Weight 2.437 lb (1,105 g) empty, w/ magazine (FM 23–35, 1940)
Length 8.25 in (210 mm)
Barrel length 5.03 in (127 mm), Government model;
4.25 in (108 mm), Commander model;
3.5 in (89 mm), Officer's ACP model
http://en.wikipedia.org/wiki/M1911
Now the H&K weights (including full frame autos)
Weight With magazine, unloaded:
748 g (1.65 lb) (USP 9 mm)
753 g (1.66 lb) (USP .40)
789 g (1.74 lb) (USP .45)
1,080 g (2.38 lb) (Match)
1,043 g (2.30 lb) (Expert)
862 g (1.90 lb) (Tactical)
667 g (1.47 lb) (Compact)
694 g (1.53 lb) (Compact .40)
726 g (1.60 lb) (Compact .45)
Length 194 mm (7.64 in) (USP)
200 mm (7.87 in) (USP .45)
240 mm (9.45 in) (Match)
224 mm (8.8 in) (Expert)
218 mm (8.58 in) (Tactical)
173 mm (6.81 in) (Compact)
Barrel length 108 mm (4.25 in) (USP)
112 mm (4.41 in) (USP .45)
153 mm (6.02 in) (Match)
132 mm (5.20 in) (Expert)
129 mm (5.08 in) (Tactical)
91 mm (3.58 in) (Compact)
96 mm (3.78 in) (Compact .45)
http://en.wikipedia.org/wiki/Heckler_&_Koch_USP
Gee there's no difference in weight is there. So all gun (handgun) weights are the same huh. Well I'll see your 2.5lbs to my 1.5lbs (let's not forget the fact that guns need ammo to be of any use) any day. That extra pount DOES make a difference believe it or not.
I'm wondering if you have a fancy nickel-plated 1911 by chance? Maybe you saw too many reruns of Miami Vice or maybe you're just "compensating" for something. Whatever it is you need to check yourself and your facts. Don't try to come here and spew fictitious nonsense and expect everyone to believe it to be gospel because you say so.