Hi
I will let the pics do the talking as I am not an expert on guns but just was more wanting to show the quality between two sets.
Trumpeter gun on top (set for $5.50 AUS), Live resin gun on bottom (set for $7.00 AUS). Both have been sprayed with a light coat of Tamiya fine grey primer.This was done as the guns were different colours.
Live resin have their pour stubs in better spots and you also get extra mags and grab handles ( not sure what there called but you can see them in the company pic I have included pic. Also you get six guns in the live resin pack and only four in the Trumpeter pack but two of them are differnt types of guns.You also get in the Trumpeter pack the slings for the guns and the gun sights.
I like both sets to be honest but live resin comes out on top as you get more guns of the some type and the pour stubs are in better spots.
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Hope this give you an idea of quality
http://www.brisbanemodelbuilder.com/