November 2026 // By Carl Woodard
An island barrel is a 2011 or 1911 barrel with a raised rib, called the island, near the muzzle that fits up through a matching window cut in the top of the slide. The island locates the front of the barrel in the slide, so the gun does not need a barrel bushing. On most island barrels the front sight sits on the island, and the rib shows through the slide like an island, which is where the name comes from.
We build island barrel 2011s and ship Island Barrel Build Kits from our shop in Seguin, Texas. This is how we explain the design to customers: how the island works with the slide, how it compares to bushing and bull barrels, and what to check before you buy one.
A standard 1911 or 2011 centers the muzzle with a separate barrel bushing pressed into the nose of the slide. An island barrel drops the bushing. The island fits a window in the top of the slide, and that fit puts the front of the barrel in the same place every time the gun goes back into battery.
The back half of the barrel works like any 2011. The hood and locking lugs lock into the slide, and the link pulls the barrel down to unlock. When you fire, barrel and slide move back together for a short distance. Then the barrel tilts down and stops while the slide keeps going. The island drops out of its window on the way back and rises into it again as the slide closes.
Side view, not to scale. The gold section is the island rib, filling the window in the top of the slide.
Here's why competition shooters like the design. On a bushing 2011, the front sight rides on the slide and travels the full stroke with it. On an island barrel the front sight sits on the barrel, and the barrel stops early, so the sight moves less and is easier to track between shots. If you run a red dot on the slide, the dot does your aiming. The island still gives you the bushingless front end and a clean place to port the barrel.
There are three common ways to center the front of a 2011 barrel. All three lock up the same way at the back. The difference is what holds the muzzle end.
| Bushing Barrel | Bull / Cone Barrel | Island Barrel | |
|---|---|---|---|
| What centers the muzzle | A separate bushing in the slide nose | The barrel's thicker muzzle fits the slide nose directly | The island rib fits a window in the top of the slide |
| Barrel bushing | Yes | No | No |
| Front sight | On the slide | On the slide | On the island, on most designs |
| Top of the slide | Solid | Solid | Open window over the island |
| Porting | Needs an opening cut in the slide over the ports | Needs an opening cut in the slide over the ports | Ports vent through the island window |
| Front-end fitting | Barrel to bushing, bushing to slide | Muzzle to slide nose | Island to slide window |
Is an island barrel better? For a range or competition 2011, I'd build it on an island barrel. That's why our Islandboy™ line is built on one. A well-fitted bushing barrel is still a good, accurate setup. The island earns its place when you want the front sight on the barrel, no bushing to fit or wear, and porting without cutting extra holes in the slide.
An island barrel is a bushingless barrel whose rib shows through the top of the slide. The island locates the muzzle end, usually carries the front sight, and gives a ported barrel a straight path to vent gas up.
Ports are holes machined through the top of the barrel near the muzzle. When the gun fires, some of the gas behind the bullet escapes up through them, which pushes the muzzle down and cuts muzzle rise. For a refresher on the basics, see our guide to barrel porting a pistol.
An island barrel is a natural fit for ports because the barrel top already shows through the slide. On our Island Barrel Build Kits, all porting is done on the barrel, not the slide. You pick the configuration when you order, and we machine it in our shop before the kit ships:
The Extreme 6-port vents a lot of gas, which leaves less energy to cycle the slide. Your recoil spring weight and your ammo have to be matched to it, or the gun may not run reliably. If you're new to the 2011, start with the 3-port.
The full breakdown of all three, including the tuning steps for the 6-port, is in Island Barrel Porting Options Explained.
Most of the cost and difficulty in an island build is in fitting the barrel. Fitting one from raw parts normally takes lathe work and lug cutters. So the first question to ask about any kit is how much of that work is already done.
No, but you need patience and to be comfortable working slowly with hand tools. The kit still needs the final bottom lug fit and slide-to-frame fitting. You can do that yourself, or send the slide and frame to a qualified gunsmith before final assembly.
If you're on the fence, read Can I Build a 2011 From a Kit Myself? and the tool list first.
Every option below is 9mm on the 5" Government platform, and every kit comes in non-ported, 3-port and 6-port. If you want the full first-build walkthrough, start with Stop Buying, Start Building.
Island barrel machined to the slide, LPWS Chiraq slide, LPWS 2011 frame, plus the guide rod and recoil spring, firing pin parts, extractor, ejector and slide stop.
The build kit plus the LPWS Kill Switch trigger, fire control parts, shield safeties and the LPWS aluminum Chiraq grip kit.
The LPWS island barrel by itself, for builders who already have the rest of the gun planned.
Kits ship unfinished. The parts need a surface finish such as Cerakote, DLC or PVD after assembly, and that is not included in the kit price.
The frame is serialized and ships to an FFL only. Some states and cities are restricted. Check the shipping section on the product page before you order.
An island barrel is a 2011 or 1911 barrel with a raised rib near the muzzle, called the island, that fits up through a window cut in the top of the slide. The island locates the front of the barrel, so the gun does not need a barrel bushing. On most designs the front sight sits on the island.
For a competition or range 2011, we think so. An island barrel puts the front sight on the barrel, removes the bushing, and lets a ported barrel vent through the slide window without extra slide cuts. A well-fitted bushing barrel is still an accurate setup, so the right choice depends on how you'll use the gun.
Yes. Like any 2011 barrel, it has to be fitted to its slide and frame. On LPWS kits we machine the barrel to the slide, set the hood length and match the island rib to the slide. You do the final fit on the bottom lugs and the slide-to-frame fit, or have a gunsmith do it.
No. The island fits a window in the top of the slide, and that fit locates the muzzle end of the barrel. LPWS island kits run an EGW guide rod and reverse plug recoil spring instead of a bushing.
Yes. Ports are machined into the top of the barrel and vent gas up through the slide window. LPWS Island Barrel Build Kits come in Standard (non-ported), Performance 3-port and Extreme 6-port. You choose at order time, and the 6-port needs its recoil spring and ammo matched to run reliably.
Island barrels are found mostly on competition and high-end custom 2011s, plus some production models. At LPWS, the Islandboy™ line is built on an island barrel, and our Island Barrel Build Kits and Islandboy™ Complete Build Kits let you build one yourself in 9mm on a 5" Government frame.
// Pick Your Kit and Your Porting