The Milwaukee 2642-21CT M18 Cordless 20-oz Aluminum Barrel Caulk and Adhesive Gun Kit is a battery-powered dispensing gun built for caulk, sealant, and construction adhesive applications where control matters as much as force. This is a caulk and adhesive gun designed for smooth, controlled dispensing of high- and low-viscosity materials. Model Number: 2642-21CT. If you are sealing joints, laying adhesive, setting windows, handling glazing work, or running long beads on a remodel, this tool is built to speed up the job and cut down on hand fatigue.

What separates this gun from a basic manual setup is the combination of power and control. Milwaukee rates it at up to 950 lbs of dispensing force, which matters when you are pushing thicker adhesive or working in cooler conditions where material does not want to move. At the same time, the variable-speed trigger and 6-setting max speed dial let you tune the flow rate from 0 to 21 inches per minute. That gives you the ability to slow down for detailed sealing work or speed up for longer adhesive runs without losing bead consistency.

Milwaukee also adds CFT Constant Flow Technology, which is there for one reason: steadier output. Instead of pulsing or surging as the motor cycles, the tool is built to keep the material feeding at a more even rate across different viscosities. In real use, that means cleaner-looking beads, less stop-and-start buildup, and less time going back to tool the joint or clean up excess squeeze-out. The anti-drip mechanism helps on the back end by stopping material flow when you release the trigger, so you are not leaving a mess every time you reposition.

The gun is set up around a 20 oz aluminum barrel sausage configuration, which makes sense for users who want cleaner loading and less cartridge waste. The barrel system is backed by a rotating quick-change collar, so you can better control nozzle angle around corners, vertical seams, and awkward positions. Milwaukee also notes that the collar accepts its quick-change configurations, including 10 oz carriage, quart-size carriage, and 20 oz sausage barrels. That adds flexibility if your work changes from sealant to adhesive or from cartridge to sausage packs.

From a jobsite practicality standpoint, the cordless M18 platform is the real win. You are not tied to a cord, and you are not relying on hand pressure for every inch of bead. The included M18 Compact REDLITHIUM battery and M18 and M12 multi-voltage charger make this a ready-to-run kit, and Milwaukee states the battery can dispense more than 200 10 oz tubes of construction adhesive on one charge. That kind of runtime matters for punch lists, exterior sealing, and service work where moving quickly from one area to the next is part of the day.

Physically, this is not a tiny tool. It measures 28 in long, 10.4 in high, 4.1 in wide, and weighs 6.5 lbs. That longer body is part of the tradeoff for sausage-barrel capacity and extra pushing force. The upside is you get a tool that is better suited to repeated dispensing tasks than a compact hand gun, especially when you are working with tougher material or trying to keep a long, consistent bead without hand strain.

Who should buy it? This kit makes the most sense for contractors, remodelers, glaziers, siding crews, insulation installers, and serious DIY users who regularly work with sealants or adhesives and want repeatable results. If you only open a tube once every few months, a manual gun is still fine. If adhesive and sealant are part of your workflow every week, the Milwaukee 2642-21CT saves time, saves your hands, and gives you better control over the finished bead.

A real upgrade from a hand gun

The Milwaukee 2642-21CT M18 Cordless 20-oz Aluminum Barrel Caulk and Adhesive Gun Kit is the kind of tool that makes sense the minute you have to run a lot of bead with thick material and still want it to look clean.

• Who it's for: Pros and regular users applying sealants or construction adhesive often enough that hand fatigue, uneven beads, and material waste are real problems.
• Why it stands out: The big one is the 950 lbs of force, but the better story is the control package: variable-speed trigger, 6-setting dial, Constant Flow Technology, and anti-drip all in one tool.
• Worth knowing: This is a longer 20 oz barrel setup, so buy it for production and control, not for the smallest punch-list spaces. The upside is you get capacity and better performance with tougher materials.

• What battery platform does this tool use? It uses the Milwaukee M18 battery system.
• How much dispensing force does it provide? Milwaukee rates it at up to 950 lbs of dispensing force for high-viscosity materials.
• Can you adjust the dispensing speed? Yes. It has a variable-speed trigger and a 6-setting max speed dial with a stated flow range of 0 to 21 inches per minute.
• Does it help reduce material drips after the trigger is released? Yes. Milwaukee includes an anti-drip mechanism designed to stop material from oozing when you release the trigger.