![]() ![]() For that, the unit relies on the lip of the magazine well. The trigger guard on the M203 Grenade Launcher swivels around a forward mounting point but has no rear anchor. At the rear, the launcher slides into the barrel nut. This “U” clamp provides the hard mount for the M203 Grenade Launcher at the forward end. It’s a bit tricky to seat the two halves of the spacer inside of the metal bracket when you get to attaching the M203 to the bracket, but persevere, the end result is worth it. There’s a polymer collar that protects and insulates the barrel. Now that the barrel is exposed, you can slide the front mounting bracket into place. LMT M203 Grenade Launcher Installation Parts Check Once you do that, the handguard simply pulls out of the triangular support behind the A2 gas block and sight housing. Just pull the delta ring towards the receiver enough so that you can rotate the base of the handguard out from underneath. I didn’t have one and relied on muscle power, so it’s doable either way. Technically this doesn’t require tools, but a handguard removal tool will really help as the spring under the delta ring is under some pressure. Since the launcher replaces the handguard, the first step (after making sure the rifle is unloaded!) is to remove the standard triangular handguard from the BRN-601 AR-15 rifle. Step 1 is to remove the existing handguard by pulling down the delta ring to free the two halves. While a simple process, it did require a bit of muscle and brute force at times, so an extra pair of hands might help. I found that the installation of the M203 launcher on the Brownells BRN-601 was straightforward once I found the instructions. This component is not a complete mounting kit but rather an add on to either of the rifle or carbine mounting kits that allows quick attach and detach of the launcher. Note the replacement handguard and leaf sight. Like the 20-inch barrel mounting kit, this one also comes with a leaf sight and replaces the whole handguard assembly. 625″ outer diameter cutout just ahead of the gas block, then carbine-style mounting kit is what you need. If you have a more recent M4-type rifle that uses or has a circular front cap and the. M203 Carbine-style Mounting Kit with Leaf Sight We’ll walk through the installation steps in detail in a minute. The replacement handguard comes with the leaf sight. This model installs completely behind the A2-style gas block and front sight housing assembly and requires a rifle with the standard mil-spec barrel nut. The “standard” original mount replaces the triangular handguard with black polymer versions containing internal aluminum heat shields. M203 20-inch Mounting Kit with Leaf Sight ![]()
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