Well, in my personal experience, Gander Mountain sucks beyond all possible belief. The first, last, and only experience I had with their gunsmithing was very similar to yours...
"Gander was supposed to install them but instead gave me a bucket full of 1911 parts plus the two parts I ordered, charged me $75 and said "Good luck!". "
I took my custom Mauser '95 rifle into the store that used to be in Bloomington, (the original Burger Bros site after they bought them out), (it's a very nice job, really - complete custom. Fitted with a Winchester Model 70 bbl in 257 Roberts, Timney trigger, Leupold scope base, new custom bolt shroud, etc. and a beautiful stock) at any rate, I took it in to have the bolt shroud fitted. The head gunsmith had his cards out - "Expert in Custom Rifles" so I thought, great...
Well, a month later I got a call to pick it up. The expert wasn't there - never actually saw him. The "new guy" who was a recent grad of a gunsmithing school - which still should be good - handed me the disassembled rifle, and a bag of miscellaneous Mauser bolt parts (all for a Model 98), and my original shroud, which had been squeezed in a vice until it had split almost completely through. He then mumbled something about not being able to make it work, and left me there. The charge? -- a mere $150.00! I paid it, and then went home and thought about it and cancelled the check with my bank. I eventually got a collection letter from their collection company, and sent a letter in reply explaining why I had cancelled my check, and copied the store manager on it. I never heard from them again. (I believe I may also have mentioned I was willing to go to jail before I'd make good on that check...)
Oh, and the last time I made the mistake of going in to buy some ammo, I asked the guy working in the ammo dept a question about the different levels of Federal ammo. His response? - "I don't know, I usually work in the Shoe Dept..."