Sig M400 .300 Blackout barrel replacement
Does anyone know if I can simply swap out my .300 blackout barrel with a .556 barrel in my M400? Ammo is getting expensive. If so, can y’all recommend a good, inexpensive vendor?
-
Any AR barrel should work. Depending on the length of the current gas system you may need to get a new gas tube along with a new gas block to fit the diameter of the new barrel. Those parts won't break your piggybank. How much you decide to spend on a barrel depends on the strength of your wallet.
The best place- In fact the ONLY place to buy ammunition in the Gun Broker forums is...the GB auctions.
0 -
Sorry. I meant a vendor recommend to buy the barrel. I’m switching barrels because 556 is about 50% the cost of 300 blackout.
0 -
Would this one work? Would I need the gas tube? https://www.gunbroker.com/item/891286382
0 -
You need to determine if your present barrel has a carbine or pistol gas port/gas tube. You can google this and get the measurements. The barrel you linked is a carbine gas and many/most 300AAC barrels use pistol gas port location so I'm guessing that yes, you'd need a different tube.
0 -
Might be a bit more expensive, but you could just drop a new upper on it.
New SIG Sauer M400 Tread 223 M-LOK Upper w/FA Bolt Carrier Colt AR15 M16 M4 - AR15 Parts at GunBroker.com : 889993042
Buy New SIG Sauer M400 Tread 223 M-LOK Upper w/FA Bolt Carrier Colt AR15 M16 M4: GunBroker is the largest seller of AR15 Parts Gun Parts All: 8899930420
Please sign in to leave a comment.
Comments
5 comments