Always a good choice is a membership in the National Rifle Association. Fighting for our Second Amendment Rights is just a small part of what the NRA does. Along with your membership you get a 12 issue subscription to your choice of one of three magazines, death & injury insurance, $2,500 firearms loss insurance and valuable discounts. They usually offer some kind of bonus like a free duffel bag or pocket knife.
Sign up here
If the gun nut in your life doesn't have a decent Christmas stocking, you could get them one of these Tactical Stockings....they come in several colors including OD, FDE, Camo, tactical Black and others...Amazon has them for $20 or less
How about a bottle opener made from a 50 BMG cartridge? They have several color choices and you can even have it personally monogrammed. Find them here
How about some gun themed liquor? They have Kalashnikov Vodka......
.......Old Carbine Tequila ........
....and Tommy Gun Vodka
Every sophisticated gun owner needs a set of cuff links....why not some made from his favorite cartridges? The Duke ones are from the special John Wayne Tribute ammo produced by Winchester Western
I found both of these sets on ebay
If your gun nut owns a 1911 pistol (and who doesn't??) they might like a set of custom grip screws from VZ grips, they have more than 20 styles to choose from and they are less than $20!
check them out here
Every gun owner needs a way to transport their rifle to and from the field, there are few better made cases than those made by Red Oxx.
These super duty cases come in 12 colors, in addition Red Oxx is Veteran owned & operated and they make them right here in the USA!
Reactive Targets are a great idea, they are re-usable (which is good for the environment and their wallet) and funner to shoot at than a paper target.
The guys at The Target Man have several to choose from (and they are made in the USA!)
If your gun nut owns a Ruger 10-22 they need one of these tools (and if they don't own a 10-22, you can buy them one!)
The 10-22 Bolt bar makes assembly/disassembly of your 10-22 a snap, these are also made here in America. You can buy them here
Another great gift for the 10-22 owner is a BX-25 x 2, this is two BX-25 magazines stuck together. The Ruger Engineers simply created a new center piece and used the two outside pieces from standard BX-25 mag shells bolted to it. They work great and the Hoplophobes really hate them, so it's a win-win!
MTM Casegard makes this great kit that includes a 50 caliber sized ammo can and as many as 10 100-round ammo boxes. They make them for 9mm (shown), 45 ACP and 223. They are durable, stack-able, lockable, water tight, lighter than the steel ones, come with the caliber labeled on the front and best of all they are made right here in the USA!
How about a USB "thumb drive" disguised as a gun?....just don't take it through airport security....
These gun socks from allen are on my x-mas list every year, they serve two purposes, they protect the rifles and shotguns from getting bumped and scratched when moving guns in and out of the safe and the silicon impregnated material helps to prevent rust and corrosion.
If your gun nut is also a Ruger fan you might consider buying them a Ruger logo door mat, they are made from heavy duty rubber and are sized 24"x36". You can buy them from Shop Ruger.com
Almost every shooter at one time or another needs a rifle or pistol rest to dial in there sights or scopes. This Caldwell Lead Sled is one of the best for the money
If the Lead Sled is a bit too much for your budget Caldwell has more affordable options like the Matrix
Or perhaps shooting bags, that come in Green and Pink