350 Legend 16in Barrel
- Twist
- 1:16
- Gas system
- Carbine
- Thread
- 9/16x24
- Gas block
- .875
Uses your 5.56 bolt
SKU 810190110355350 Legend, 400 Legend and 450 Bushmaster barrels, button rifled from 4150 CMV steel and finished in nitride. In stock barrels ship within 1 to 2 business days, in time for the 2026 deer season.
Every barrel here is button rifled 4150 CMV steel with dimpled fluting, a nitride finish and a threaded muzzle. Pick a caliber to narrow the list.
Rifle length. The three to build a deer gun around.
Uses your 5.56 bolt
SKU 810190110355Needs a 6.8 SPC pattern bolt
SKU 810190110379Needs a 450 Bushmaster or 458 SOCOM bolt
SKU 810190110393For AR pistols and registered short barreled rifles.
Uses your 5.56 bolt
SKU 810190110348Needs a 6.8 SPC pattern bolt
SKU 810190110362Needs a 450 Bushmaster or 458 SOCOM bolt
SKU 810190110386Barrels under 16in are for AR pistol builds and registered short barreled rifles. Check federal law and your state's hunting rules before you build.
Not sure which caliber? Compare all threeSee what else the build needs
Four Midwest states made the straight wall AR15 what it is today. Ohio and Iowa still write their gun season rules around these calibers. Michigan and Indiana have opened up to other cartridges, and plenty of hunters there are staying with straight wall for the reason the rules existed in the first place: flat country and shots inside 200 yards.
Order byNov 16for the Nov 30 opener
Ohio deer regulations, Administrative CodeOrder byNov 21for the Dec 5 opener
Iowa DNR deer huntingOrder byNov 1for the Nov 15 opener
Michigan DNR 2026 deer regulationsOrder byOct 31for the Nov 14 opener
Indiana DNR deer hunting equipmentOrder by dates leave two weeks to ship, install and zero before opening day. Rules are summarized from each state's wildlife agency as published on October 7, 2026. Regulations change, so confirm with your state before you hunt.
A straight wall cartridge has no shoulder. The case runs straight from base to bullet instead of necking down the way a 5.56 or .308 does. That shape carries a wide, heavy bullet at moderate speed.
The result hits hard at typical deer distances and runs out of energy sooner than a bottleneck rifle round. In flat, settled farm country that shorter reach is the point, which is why Midwest states that once allowed only shotgun slugs opened their gun seasons to straight wall rifles.
350 Legend, 400 Legend and 450 Bushmaster were all designed to fit the AR15. Change the barrel, match the bolt and magazine, and the rifle you already own is a deer rifle.
All three are proven on whitetails inside 200 yards. The difference is how much recoil you are willing to trade for energy.
| Compare | 350 Legend | 400 Legend | 450 Bushmaster |
|---|---|---|---|
| Bullet diameter | .355 in | .400 in | .452 in |
| Typical deer load | 150 gr at 2,325 fps | 215 gr at 2,250 fps | 250 gr at 2,200 fps |
| Muzzle energy | 1,800 ft lbs | 2,416 ft lbs | 2,686 ft lbs |
| Recoil | Lightest of the three | In between. Winchester rates it about 20% under 450 Bushmaster | Heaviest of the three |
| Bolt | Standard 5.56 bolt | 6.8 SPC pattern bolt | 450 Bushmaster or 458 SOCOM bolt |
| Pick it if | You want low recoil, typically lower ammo cost and no new bolt | You want 450 class energy with less recoil | You want the most energy on target |
| Tier 1 barrels | 16in and 7.5in | 16in and 7.5in | 16in and 11.5in |
Factory published figures from 20in test barrels: Winchester 350 Legend 150 gr, Winchester 400 Legend 215 gr, Hornady 450 Bushmaster 250 gr. Expect a little less velocity from a 16in barrel and noticeably less from 7.5in and 11.5in.
If you already own an AR15, a barrel is most of the way to a straight wall deer rifle. Your lower, buffer system, handguard, trigger and optic carry over. These are the parts that change.
| Part | 350 Legend | 400 Legend | 450 Bushmaster |
|---|---|---|---|
| Bolt carrier group | Your standard 5.56 bolt carrier groupShop 5.56 BCGs | 6.8 SPC pattern bolt (.422 bolt face)Shop 6.8 SPC BCGs | 450 Bushmaster or 458 SOCOM bolt. They are the same bolt (.473 bolt face), and the 458 SOCOM is the one you will see most oftenShop 458 SOCOM BCGs |
| Magazine | Use 350 Legend magazines for reliable feedingShop 350 Legend magazines | 400 Legend magazineShop 400 Legend magazines | 450 Bushmaster magazineShop 450 Bushmaster magazines |
| Gas block | .875 journalShop .875 gas blocks | .875 journalShop .875 gas blocks | .936 journalShop .936 gas blocks |
| Gas tube | Carbine length on the 16in. Pistol length on the 7.5in | Carbine length on the 16in. Pistol length on the 7.5in | Mid length on the 16in. Carbine length on the 11.5in |
| Upper receiver | Standard AR15 upper | Standard AR15 upper | Standard AR15 upper. The ejection port may need to be enlarged |
| Muzzle thread | 9/16x24Shop 9/16x24 muzzle devices | 9/16x24Shop 9/16x24 muzzle devices | 11/16x24Shop 11/16x24 muzzle devices |
Tier 1 Tactical is a rifle and suppressor maker based in Walford, Iowa, in the middle of straight wall country. Here is what goes into each barrel.
The rifling is formed by pulling a hardened button through the bore, which leaves a smooth, uniform finish. It is a method accuracy focused barrel makers have relied on for decades.
Takes weight off the barrel and adds surface area to shed heat, without giving up rigidity.
Nitride hardens the surface of the steel itself, bore included, so it resists wear and corrosion. Made for December weather.
9/16x24 on 350 Legend and 400 Legend, 11/16x24 on 450 Bushmaster. Run a brake or a suppressor.
Proven hands on in demanding conditions.
Tier 1 barrels are in use by a law enforcement department today. And Cody Curry of 110 SASS ran a Tier 1 Kratos through a 25,000 round endurance test. Watch it for yourself.
25,000 rounds through a Tier 1 KratosEndurance test by Cody Curry of 110 SASS
One page with the bolt, magazine and gas parts each caliber needs, plus 2026 season dates for Ohio, Iowa, Michigan and Indiana. We will also send one reminder before your state's order by date.
A cartridge with no shoulder. The case runs straight from base to bullet instead of necking down the way a 5.56 or .308 does. Straight wall cartridges fire wide, heavy bullets at moderate speed, so they hit hard at typical deer distances and lose energy sooner than a bottleneck rifle round. That shorter reach is why several Midwest states wrote them into their deer rules.
Ohio requires a straight wall cartridge from .357 to .515 caliber for rifles in its gun seasons. Iowa uses a bullet diameter rule (.350 to .500 inches with at least 500 foot pounds) in its youth, disabled hunter and shotgun seasons, which 350 Legend, 400 Legend and 450 Bushmaster all meet. Michigan dropped its limited firearms zone in 2026 and Indiana opened to most centerfire rifles in 2025, so straight wall is optional in both. Other states have their own zone and season rules, and some do not allow semiautomatic rifles for deer at all. Check your state's current regulations before you build.
Yes, if it is chambered for a legal straight wall cartridge such as 350 Legend, 400 Legend or 450 Bushmaster and loaded with no more than three rounds, chamber and magazine combined. A 5.56 AR15 is not legal for deer in Ohio.
Not in the youth, disabled hunter or shotgun seasons. Those seasons require an expanding bullet from .350 to .500 inches across. A barrel swap to 350 Legend, 400 Legend or 450 Bushmaster puts your AR15 inside the rule. Iowa's January antlerless season, where open, has its own list of legal rifles.
Yes. 350 Legend uses the same bolt face as 5.56, so your current bolt carrier group works. Use 350 Legend magazines for reliable feeding.
400 Legend uses a 6.8 SPC pattern bolt. 450 Bushmaster uses a larger bolt: a 450 Bushmaster bolt or a 458 SOCOM bolt. Those two are the same bolt, and the 458 SOCOM is the one you will see for sale most often. Both calibers need magazines made for them.
350 Legend and 400 Legend barrels have a .875 gas block journal. 450 Bushmaster barrels have a .936 journal. Gas tube length depends on the barrel: pistol length on the 7.5in barrels, carbine length on the 16in 350 Legend, the 16in 400 Legend and the 11.5in 450 Bushmaster, and mid length on the 16in 450 Bushmaster.
350 Legend has the lightest recoil, typically the lowest ammo cost, and it reuses your 5.56 bolt. 450 Bushmaster carries the most energy. 400 Legend sits between them: Winchester rates it at energy comparable to 450 Bushmaster with about 20% less recoil. All three are proven on whitetails inside 200 yards.
Each barrel is button rifled from 4150 CMV steel, cut with dimpled fluting and finished in nitride inside and out. Nitride hardens the surface of the steel itself.
Barrels under 16in are for AR pistol builds and registered short barreled rifles. Putting one on a rifle without federal registration is against the law. States also set their own rules for hunting with pistols and short barreled rifles, so check before you build.
In stock barrels ship within 1 to 2 business days. The order by dates on this page leave two weeks to ship, install and zero before opening day.
Stock these barrels before the opener. Tell us about your store and we will set up a call.
Become a dealerHunting regulations vary by season, zone and property, and they change. This page summarizes rules as published by each state wildlife agency on October 7, 2026. It is not legal advice. Confirm current regulations with your state before you hunt.
Sources: Ohio deer regulations, Administrative Code, Iowa DNR deer hunting, Michigan DNR 2026 deer regulations, Indiana DNR deer hunting equipment.
Certain states prohibit advertising or marketing of firearms, ammunition, and related firearm components to minors. You must be over the age of 18 to shop our site.
