The only hard part with building them is getting parts right now. There's a few websites that are helpful in tracking stuff down, AR15.com has a ton of resources, as well as arpartsfinder.com
Check out this link, guys list up parts as they become in stock in various threads:
Build it yourself forum:
Build It Yourself - AR15.COM
but be warned, some shit is stupid expensive right now, all the rednecks in the country have put a run on the market
Actually just finished my very first build this weekend
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Good to see other fellow gun enthusiasts. Any other collectors/03 FFL C&R holders here?
I have a nice balance between my WW2 collectables and modern firearms.
A few of my recent modern purchases (before everything went nuts) I'm a huge Glock fan, but nothing can every replace the legendary 1911 platform:
Ruger SR1911
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Russian VEPR 12 (12 gauge semi-automatic shotgun) It took many aspects of the Saiga 12 and made them better basically.
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-T1
1911's give me a boner