Ok. Few quick questions:
1. Has anyone ever got a really good deal on Gunbroker? I'm kind of a noob to it.
2. If I buy a pistol length .300 Blackout upper, will any AR lower fit it? Any brands to avoid?
3. What's a decent price on a Remington 7400 Carbine?

I was looking at gunbroker alot. If you didn't have to pay transfer fees and ffl fees and shipping, you could get some good deals. Search buy now. Think I saw some 7400 remingtons on armslist earlier today, may be mistaken.

I gut a stainless Ruger GP-100 for $330 a few years ago. Back sight was broke but I had plans to put firesights on it anyway.

#1 Yep, It's been 8-10 years, but I bought 3 new stainless Browning A-bolts , the most I gave for one was $617 . About 6 years ago I snuck up on a NIB Sako model 75 Finnlight for $ 1,050 shipped. 2 of the above were from dealers 2 from individuals.

Several 7400 remingtons on armslist right now.just checked for you

1. Yeah I have gotten several things from there. Just like any other place like it be patient and you will find a deal. I usually have better luck at Buds though.

2. Any lower will work for the pistol length upper. So far I have used Stag, Anderson, PSA and Aero. They all seem to work just fine.

3. Ain't got a clue on that

1. I've found a few deals on there. I've also got into bidding wars and won and lost at the same time.
2. Any AR lower should work fine. Just make sure it's AR15 and not AR10.

#1 yes. I bought 4 stainless ultra lite public defenders from a guy closing his gun store.

1) I have gotten a couple good deals from GunBroker, both on shotguns. Both Remington 870's 20ga. One from an estate, WingMaster Magnum 80' model another was one I couldn't find anywhere, a Sportsman Field.
2) No experience
3) I have a 7400 Carbine, sweet gun, have never had any problems, goes boom every time I pull the trigger. Pretty accurate too. Value, a solid 90-95% gun is gonna run 5 bills

As for 2. Yes All stripped lowers are the same. But, back sure you don't out the pistol length upper on a lower with a stock. It must be put on one with a pistol buffer tube.

1) Yes, last year bought a Colt 6920 for right at $700 (plus $25 shipping & $15 Transfer from my FFL...Total $740) At the time they were going for $900 up. Just have to be patient and check often.
2) Yes, any lower should work
3) No Clue

Doekiller beat me to it. Be very careful of this as you do not want to run afoul of the NFA.

#1 i havent but mark bought a 3200 dollar armalite ar10 for 1500
#2 like others said and lower will work as long as it has a pistol tube
#3 those 7400 are everywhere

[quote=extreme heights hunter]#1 yes. I bought 4 stainless ultra lite public defenders from a guy closing his gun store. [/quote
] You and James have issues

Yes. Be sure to factor in shipping, FFL transfer, and credit card fees into the price of each item. You can get great deals if you dig and are patient.

You can search closed auctions to see what things are selling for.