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Old 02-01-2013, 18:46   #1
ModGlock17
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A quick review on JPoint4 on a G20

FYI. A quick review on JPoint 4 (4 MOA dot)

This is a really light unit, may be close to the weight of a quarter dollar coin. It is designed to mount with a couple of screws on to a thin platform. You can buy various platforms for various gun designs, even for picatinny rails. This allows you to move it to different guns, from sight on handguns to functioning even as quick sight on rifles. Be aware, however, platforms are sold separately.

Maximum profile height is about a quarter's height above the platform, which is not much at all, and doesn't interfere with the overall look of the gun as much as the more obnoxious red-dot sight in tube design.

Aside from the attachment screws, there are three Allen screws, two horizontal ones on each side and a vertical one for vertical adjustment. One of the horizontal ones, on the left side as you look thru the sight, is not to be messed with, because it provides a horizontal reference location.

JPoint includes a dial that fits on the provided Allen wrench to give a better feel for adjustments.

Important: there is no ON/OFF switch. The commonly found cr2032 battery provides the power. Some think it is on all the time drawing little current, some think the protective hard plastic cap turns it off in storage.

I mounted it on my 6" barreled G20 shooting high powered rounds (750 ft-lbs plus). And it functions VERY well enduring the recoil of 10mm rounds. Note that the add't weight of the 6" barrel tamed some recoil compared to a stock G20 barrel. Rested on a fixed cradle, I can consistently hit orange clay disc at 20 yards. I'm sure many of you can do better!

Overall, it doesn't add much to the weight of the gun, or to profile of the gun (in my view). The whole gun holsters easily. The tiny dot is bright in day time, and may be a bit too bright at night.

If you are willing to be set back by some $300+, this thing can work well ...




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Old 02-03-2013, 01:06   #2
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Do you have any pic's? I have wondered how it would work on a carry gun.Mine is a G20,G29. Have read about several LEO have used them. alot to spend if I don't like it.
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Old 02-03-2013, 20:01   #3
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Yes. I'll shrink some pics and post them soon.

I took it to the range again today. 25 yards. Try to fine zero in. When it is well rested, I would get mainly vertical variation. This G20 setup + ammo + JPoint4 is amazingly accurate. If I try really hard, I'd think 1" group at 25yrds can be done, rested. That's 4 MOA, right?

Free hand.... I AM the variation!

Practically, JPoint4 is overkill if you plan to shoot freehand. But on occasions when a sturdy branch is available, you can easily get the wild bacon (wild hog) at distance. That, I think, is the only justification for a JPoint. For a carry gun, taking off the protective cap will take time, thus not suitable for SD, aside from the "cool" factor.


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Old 02-03-2013, 20:37   #4
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I had the same one on a g19. I had to add as shim to get sight adjusted correctly. IMO they are well suited for competitive shooting.
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Old 02-03-2013, 22:20   #5
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Does it co-witness with the iron sights?
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Old 02-04-2013, 00:16   #6
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Quote:
Originally Posted by G29SFWTF View Post
Does it co-witness with the iron sights?
No. It sits too high in the back of the slide. When I get the pics up, you'll see.


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Old 02-04-2013, 16:33   #7
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Yep ... user Gator378 has one on his G20 Gen 2 .... I got to shoot it and could easily punch out the center ring at 20 yards freehand and probably much better at even longer range if we'd have been able to bench the pistol that day.
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Old 02-04-2013, 20:37   #8
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Click image for larger version

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OK. Trying to upload pics. Looks like they turn out fine.

I ended up shooting a lot, spending a lot of ammo. Kinda fun.

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Old 02-04-2013, 21:08   #9
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Is KKM polishing their barrels now or did you do that yourself? Looks good.
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Old 02-04-2013, 21:29   #10
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Quote:
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Is KKM polishing their barrels now or did you do that yourself? Looks good.
Thx. I'm real particular about getting the equipment shiny, mirror shine. Even strike pins and trigger bars of mine are shiny in key areas. I just want them to slide as smoothly as possible, with the least of friction. If the barrel is not shiny, it wears the slide faster... or so I think.

KKM came in the most refined shape, then StormLake, then the wild dog brand. I polished them all.
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Old 02-05-2013, 13:22   #11
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If the barrel is not shiny, it wears the slide faster... or so I think.
The surface of the slide is a whole lot harder than that KKM barrel. Polishing it won't make any difference in slide wear.
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Old 02-05-2013, 16:18   #12
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The surface of the slide is a whole lot harder than that KKM barrel. Polishing it won't make any difference in slide wear.
Is that tennifer also covering the inside of the slide, where the barrel glide against, or is it just the outside?

The edge under the slide hood where the chamber part of the barrel snaps in, is a place I'd look to determine how old a resale gun is, NIB or a few hundred rounds. I look at the wear there. We talked about this in an old thread some where here.


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Old 02-06-2013, 21:02   #13
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All of the slide surfaces have the Tennifer (melonite) treatment. So does the factory barrel, inside and out. The black finish can be worn off long before you wear through the hardened surface underneath.
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Old 02-06-2013, 22:04   #14
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Personally I can't STAND polished barrels o polished chrome ... But to each his own! I like my KKM's matte silver like they come
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Old 02-07-2013, 16:23   #15
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But to each his own!
I hear ya.

Actually, there's a lot of people making huge sums of money on that very concept. Cell phone went from a Communication Tool to become a Fashion Statement when people saw the opportunity to cash in on "to each his own!" with personal color covers.

Imagine a future Glock company leader to start putting color in the plastic frame: Goldfinger gold, Steel blue, or Hot Pink. Then have a dark Tennifered slide on those. Each would have their own market demand. So colored gun become fashion statement. Hello, 2nd ad.!
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Old 02-07-2013, 17:11   #16
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So when trying to calculate sight height above center of bore when using a MRDS, so I can calculate drop at distance, where do you measure to? Center of bore to the LED diode or center of bore to the middle of the glass, or maybe bottom of the glass?
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Old 02-12-2013, 00:24   #17
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Thanks for sharing
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Old 02-13-2013, 00:36   #18
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How much did that JPoint run you?
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