If you are mechanically inclined it really isn't that difficult.
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If you don't know what you are doing, don't do it.
I own a german performance car shop. We on a daily basis are tasked with un****ing shit people try to do at home in their drive way using directions from the internet.
Tell your friend he can buy a pistol grip with a built in trigger guard. That is the best fix I can think of.
One big problem is that people don't get the right tools to do the job. If you have the right tools, some patience, and good instructions (hopefully including pictures and/or video), assembling an AR is not hard. But get the right tools (punches etc). Have patience, and get someone who has done it before and has their crap together to show you, or get good "professional" instructions and take your time.
Or get someone else to do it for you.
You'd be amazed at how a drop of oil and a simple roll of electrical tape makes installation of that pin easy. Its the perfect height and supports that ear perfectly.
Building a functional and reliable AR is not difficult, however one must be mechanically inclined and have some good common sense ;)
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While its a bit of overkill in the tools dept the Brownells blocks work quite well. I' don't know if I'd advocate going out and buying them if you didn't already have them or are going to put together lots of lowers but they do work.
http://www.brownells.com/.aspx/pid=2...HT-BENCH-BLOCK
http://www.brownells.com/.aspx/pid=2...E-BENCH-BLOCKS
http://www.brownells.com/.aspx/lid=11638/learn/
I think we can close this now before it becomes more muddled. The lessons learned are this;
1. AR's are not like Legos and require knowledge to properly build.
2. Use the right tools for the right job.
3. Take a course on how to properly build an AR.