Here is a list of vendors (in no particular order) that i use when ordering parts.
- Rainier Arms
- PK Firearms
- Bravo Co
Bravo Company USA
G&R Tactical
Rainier Arms
Midway USA
Dallas Shooting Supplies (they still had good prices on Pmags during the panic - and they sent me a Christmas card! 
)
I’ve been wanting to give Larue some business as well. It just hasn’t happened yet.
A couple more places that I look to for ammo:
Natchez Shooters Supplies
Cabelas
Bravo Company - Same state fast but no backorders
MidwayUSA - C&R discount not so great but they have lots in stock
Grafs - Dealers pay shipping & cc surcharge but they have great pricing sometimes
Natchez - pricing is usually better than Midway dealer
AIM surplus - a few things here & there
Recob’s Target Shop - Just 20 mins from my home for reloading supplies…no hazmat!
Brownell’s - good selection and the website is now easier
Galleryofguns.com - I can browse for hours & price shop
Cabelas - gift certificates come my way occasionally
Brassmanbrass - great monthly specials
If these guys don’t have it, I’ll check with the manufacturers website. If the price or stock is right, I get it from them. I’ve bought from Magpul & Yankee Hill Machine this way last year when everything was out of stock.
Bravocompanyusa.com
Westernsportonline.com
Midwayusa.com
Laruetactical.com
Aimsurplus.com
Dsgarms.com
Skdtac.com
We shop at G&R Tactical (Duh)! 
We offer LE discounts.
The thing to remember about Brownells and their discount program is that the price they base their discounts off of are generally ABOVE MAP. So you really might not be saving as much as you think.
We also offer $5 dollar shipping with insurance!
C4
Brownells
Bravo Company
Midway USA
GT Distributors
Bravo
Primary Arms
Del-ton
Saw Guns
Had excellent experiences with all of the above… the one bad experience I had was with Botach Tactical. Tried reaching them all day on their listed phone numbers, every single one went to voicemail. Every number listed by them was actually a Sprint cellphone number with a LA based area code number.
Best customer service would have to go to Primary Arms… love the service from Nick & Marshall!!
besides eguns.com of course 
I have used
Midsouth Shooters Supply recently for some dies
Graf & Sons grafs.com for brass etc
brassmanbrass is also good
DSG for some gun items
Rainier Arms for barrels
Global Tactical for some barrels
G&R Tactical for some LPK and some M&P stuff
Just signed up with you guys and sent you my info through my Dept email.
so far I’ve had great experiences @
brownells
midwayusa
blade-tech.com
bravocompanyusa.com
brightflashlights.com
laruetactical.com
magpul.com
opticsplanet.com
smartgunner.com
spikestactical.com
tangodown.com
topgunsupply.com
Ive bought stuff from some of the bigger companies like MidwayUSA and Brownells. I wont order from Brownells again, it seems every order I place Im waiting 2 weeks due to backorder. Ive had better experiences with MidwayUSA. But me being the impatient person I am, Ive made it a habit to look for companies that are closer to me and giving them a call first to check availability to reduce the shipping wait. If you are buying a quality product, then theres not usually much you have to worry about. Just make sure your getting a decent price and that its in stock, that makes the experience much better.
Ive been buying a lot from Spikes Tactical and Black Rifle Works lately, mainly because standard delivery has a package arriving to me within 2 days of ordering. 
Bravo Company has become my first stop for AR stuff
i’ve ordered from K-Var, Centerfire Systems and APEX Gun Parts fairly often when i needed something AK related.
AIM surplus gets a lot of my business as well, mostly for AK mags and ammo.
in the past i used to order from Natchez often, haven’t in awhile, i’ve always had good luck with them but i just haven’t needed anything in their inventory lately, same with Midway and Brownells, who i also like.
i’ve also had good luck with LA Police gear. i used to spend a whole bunch of money at Sportsman’s Guide, mostly on ammo and surplus clothing, but purchases from them have become pretty infrequent. their habit of advertising stuff before they even have it in stock gets on my nerves. and sometimes i’d like the option of buying just ONE East German left sock, not twelve of them.
How could I forget about ammo…
Palmetto State Armory… Ships from SC, I live in VA. So basically 1 day shipping. Good peeps, no ID required to order ammo.
Since you mention Palmetto State Armory, that reminds me…Theres a gunshop/range here called Palmetto State Shooting Center, I will NEVER give them any business again, and I make sure to let everyone of my friends know that. If anyone wants to know why, PM me, Im not trying to hijack this thread. Just thought with all the places to buy stuff being thrown out there Id throw in a place to avoid.
LAPoliceGear and OMB express get two thumbs up from me. And I typically shop at the places everyone else already mentioned.
BCM, SKD, etc
Also check out
I’ve had good luck with G&R Tactical.
Ditto plus Spikes and Alamo Tactical (Alamo is local so I can stop in).
Bravo Company
G&RTactical
BlueForceGear
SKD
Magpul
Greygroup
Brownells
DSG Arms
Rainier Arms
Weaponspart
Ammo:
Palmetto State Armory
AIMSurplus
Ammoman
Everyone always talks crap about http://www.botachtactical.com/, but I’ve ordered and EoTech and just recently a Streamlight TLR-1 C4 light and saved a butt-load of money and the items shipped the day I ordered them or the day after.
I shop at Botach sometimes and only had an issue once when they shipped a different brand batteries then I ordered.