I’m Lance Rankin, owner and gunsmith at Western Sport in Roanoke, Texas. Glocks cross my bench about as often as anything else, and I’ll tell you a shop secret: half the “malfunctioning” pistols that come in just need a decent cleaning. The good news is this is a job you can do at the kitchen table in twenty minutes. Here’s how I do it.
How to clean a Glock: gather your supplies
You don’t need much. A one-piece cleaning rod, a bore brush in your caliber, a jag and patches, a nylon brush, cotton swabs, solvent or CLP, gun oil, and a rag. A cleaning mat or an old towel saves your table from solvent stains. Any basic handgun cleaning kit covers all of this.
Unload it, then check it again
Drop the magazine. Lock the slide back. Look in the chamber, then put a finger in there and feel it. I don’t care how sure you are it’s empty; verify anyway. Every negligent discharge story I’ve heard in nearly two decades behind the counter starts with “I thought it was unloaded.” This matters double on a Glock, because takedown requires a trigger pull.
Field stripping
Glocks come apart in seconds:
- Point the pistol in a safe direction and pull the trigger to release the striker.
- Pull the slide back about a quarter inch.
- Pull down both takedown tabs above the trigger guard.
- Let the slide run forward off the frame.
- Lift out the recoil spring assembly, then the barrel.
You end up with four parts: frame, slide, barrel, and recoil spring assembly. That’s all the disassembly routine cleaning needs. Leave detail stripping to your gunsmith.
Clean the barrel
Wet the bore brush with solvent and run it through from the chamber end, eight or ten passes. Let the solvent sit a minute while you start on the slide. Then switch to the jag and push patches through until they come out clean. Wipe down the outside of the barrel too, especially the hood and feed ramp, and dry everything off. A clean bore does more for accuracy than any accessory you can bolt on.
Slide and frame
Work the inside of the slide over with a dry nylon brush. The spots that collect the most carbon are the breech face, under the extractor hook, and the slide rail grooves. Cotton swabs reach the corners, and the wooden end of one will scrape off stubborn carbon without hurting the finish. If your Glock is new and you see copper-colored grease inside the slide, leave it alone. That’s factory lubricant meant to wear in.
The frame is easier. Brush it out, wipe the metal rails and the locking block, and clean around the trigger mechanism without flooding it. Don’t hose solvent into the frame. The polymer doesn’t need it and the trigger internals don’t want it.
Lubrication: less is more
Glocks run dry better than most pistols, and extra oil just attracts grit. Four spots get a drop each:
- The frame rails and the matching channels inside the slide.
- A light film on the outside of the barrel, a touch more near the hood.
- The barrel lug where it meets the slide lock.
- The point inside the slide where the connector meets the trigger bar.
Keep oil out of the striker channel entirely. It runs dry, period. Oil in there gums up over time, and that’s how light strikes happen.
Reassembly and function check
Everything goes back in reverse: barrel into the slide, recoil spring assembly seated against the barrel lug, then slide onto the frame rails until it clicks home. Now check your work. Rack the slide and pull the trigger on the empty pistol; you should hear the striker fall. Hold the trigger down, rack the slide again, and release the trigger slowly until it clicks. That’s your reset. Pull once more to confirm. If the slide binds or the trigger feels mushy, take it back apart and reseat the recoil spring assembly. That’s the usual culprit.
How often, plus a few notes from the bench
Clean after every range trip if you can, which matches Glock’s own care guidance, and every few hundred rounds at minimum. A carry gun deserves a wipe-down and fresh oil monthly even if it hasn’t been fired, because holster lint and dust find their way everywhere. Magazines mostly need to stay dry; wipe them out and skip the solvent unless something’s actually wrong. While the recoil spring assembly is out, look it over for kinks. They’re cheap to replace, and a worn one causes sluggish cycling.
If your Glock still won’t run right after a proper cleaning, something else is going on and I’m happy to take a look. We do in-house gunsmithing here at the shop. If you’re weighing your next pistol, my Glock 19 vs Glock 17 comparison is a good place to start, and carry folks should see my picks for the best 9mm self-defense ammo. Questions? Email [email protected] or call 817-393-4000.
Lance Rankin is the owner and Chief Gunsmith of Western Sport, a family-run Type 07 FFL and Class 3/SOT dealer in Roanoke, Texas, serving shooters since 2007. Born and raised in Texas with over 50 years of experience handling firearms, Lance purchased Western Sport in 2017 and turned his lifelong passion into his profession. He specializes in AR-15 and AR-10 platform rifles, manufactures Western Sport’s own Rankin Industries parts and rifles, and runs the shop’s in-house Cerakote coating operation. When he’s not behind the counter or the workbench, you’ll find him on his ranch deep into the night, hunting coyotes with an AR-15 and thermal optics. Lance holds an MBA and personally shoots and tests the products Western Sport sells.
