Convert your Glock 17 to an extended-barrel racegun with our Glock sight block. Designed to run with the Lone Wolf threaded barrel for the Glock 34, the sight block instantly gives your standard Glock 17 the sight radius of the famed 6" Glock 17L. That's 3/4 of an inch MORE than the popular Glock 34. (NOTE: KKM Glock barrels also work well, but be sure to ask for 1/2 X 28 threads.) This is NOT a recoil compensator. Compared to a Glock 17, the total sight block slide assembly is slightly heavier. That tends to calm the gun down a bit, but may require some fiddling with recoil springs to get positive function with light loads. Because it's not a compensator, shooters can use a sight block in most types of action competition (except IDPA). It's specifically allowed in USPSA "Limited" division, and in most 3-Gun events. Easy-To-Track Front Sight: With a Sight Block, your front sight mounts directly to the barrel instead of the slide, so it moves only a fraction of an inch in recoil. That makes the front sight easier to track, and since the front sight isn't slapping all the way back and forth, your sights experience less pounding, leading to longer fiber-optic life. You'll want some thread-locking compound for the front sight screw (don't use crimped sights, they will damage the aluminum sight block). You'll want a little more for the set screw, and a little for the barrel threads themselves. We suggest the "adjustable" sort, since you will want to take the sight block off eventually to service the front sight. Short of that, we suggest leaving the sight block on semi-permanently. How Do I Clean It? Sliding the barrel forward exposes the chamber area for easy back-to-front cleaning. Does It Work With A Gen 4? YES. The new version works with Gen 3, Gen 4, and Gen 4-retrofitted-to-Gen 3 recoil systems. The latter is probably the best way to go, since it allows changing the recoil spring weight easily. (Not possible on the Gen 4's telescopic system.) Last I looked Carver Custom and Jaeger Products both offer a bushing to convert Gen 4's to the Gen 3 style. Upgrading A Glock 34? Just tell us when you order, we'll machine down the "shroud" portion of the Block to fit your longer set-up.
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I was tired of tuning comps on my Glock 17 and having to run over pressures ammo to get everything to work perfectly. I ditched the comp and used this with a 34 length barrel and an SJC frame weight and my gun stays on target better than it ever did with a comp. I will be buying more. Only thing is that the barrel doesn’t thread in flush with the end of the block so the last couple threads quickly build up lead and powder. I machined mine back about 3/16 and it fits flush. 5 stars