scooter123
Member
Previously I had installed a J Point on my model 610 and was VERY impressed with the results. Prior to getting the J Point I had been using a rail mounted Red Dot scope on the 610 and the large offset from the barrel axis caused convergence issues. Set the sight for 100 feet and the gun shot nearly 4 inches low at 25 feet. After installing the J Point I found that when sighted in at 100 feet the POI was within 1 inch of aim from 20 feet out to 135 feet. Bascially, it gave me a gun that would allow me to explode a squirrel at any range that I am capable of hitting a 2 inch target. It's also a very compact sight that allowed me to use an exacto knife to modify and off the rack Galco retention holster to carry the 610 with full retention in place.
Last week I decided to purchase 2 more J Points, one for my 617 and one for my 620. Previously the 617 was equipped with a cheap Sightmark reflex on a rail and the 617 had the same convergence issues as the 610 with the rail mounted red dot. However, in the case of the 617 it was shooting 4.2 inches low at 25 feet when sighted for 100 feet.
As for the 620, my eyes aint what they used to be and seeing the iron sights is now not possible. Tried using readers and then I couldn't get the target in focus.
First the 617. Without the angle shim installed I couldn't get the elevation adjusted perfectly at 25 yards, ran out of adjustment with the POI 1/2 inch low. However, that was close enough to see how the sight would work at varying distances. Result, very little deviation from 20 feet to 100 feet. At most, about 7/8 inch. I've now installed a 1 degree angle shim under the sight and next week I zero it in completely.
Then the 620. This one I did get to perfect conincidence with the dot at 25 yards using 125 gr. Speer Lawman TMJ. However it was at the limit for the elevation adjustment. I could try adding a shim, however I already know the gun will shoot about 4 inches high with 158 gr. 357 Magnums. So I just may leave it as it is so I have the elevation adjustment available to tune if for Magnums.
Then I ran the target back to 35 yards and did some shooting from a sandbag rest in single action. The very first shot was on center 1/4 inch low in the red bullsye on an 8 inch shoot-n-c. Peeped the shot with my spotting scope, got excited, and threw the next shot 4 inches high and 1 inch left. Then I settled down and shot a horizontal line 1 3/4 inches long from center to center with the following 4 shots. Vertical deviation of this 5 shot string was less than 3/8 inch. IMO, the horizontal stringing was due to my needing to work on my release, I suspect a better shooter could have grouped at 3/4 inch or less. However, 35 yards is a LONG ways away for this old fart, if a gnat had bumped my on the ear it would have probably have swung that dot at least an inch. Final shot I threw high and left again, 3/4 inch to the right of that first flyer.
Finished up with some rapid fire drills at 25 feet, result was a perfectly centered 4 inch group.
Conclusions.
One is that the 2 piece barrel in the 620 is capable of astounding accuracy. It is without doubt the most accurate handgun that I have ever shot. Fact is people missed the boat on the 620, it's a freaking rifle disguised as a handgun. As we used to say when I drove a taxi to pay for college, "if you snooze you lose".
Second, the J Point Reflex is IMO the PERFECT 1 to 1 magnification optical sight for a revolver. JP Rifles offers a direct mount that uses the standard 3 hole pattern in the newer guns and it results in a sight that is only offset above the barrel axis by about 1 inch. Because of this the convergence is quite low. Depending on the caliber and it's arc, I believe that it's a setup that allows near perfect hit's from about 25 feet out to 50 yards or more. It's also a sight that allows us old farts to shoot well enough to make the young bucks sit up and take notice.
The downside is they aren't inexpensive and they are an "always on" sight. Cost is currently 299.00 and the S&W revolver mount lists at 49.95. Note, the mounting kit ships with a 1 degee wedge shim that can be reversed, so the basic mount has lots of provision for getting the elevation tuned perfectly. The case also has a rear signt notch molded into it so it can be used co-witness profided a taller fron sight is installed. On my 620 putting the standard front sight right at the bottom of the notch will get a near center hit, something useful to know should the battery die. Good news is that by keeping the cover on the one on my 610 I haven't had to replace the battery yet and haven't seen any drop in intensity in the 4 months I've had it. BTW, all mounting plates feature 4 indexing posts for the sight body so when changing the battery the zero is maintained. Also, they have a built in light sensor so using the cover puts the sight into the low intensity setting to reduce battery drain. More good news is JP Rifles ships very quickly, ordered the last 2 on a Tuesday evening and recieved them on Friday by choosing 2nd day air. However, JP Rifles has yet to email the shipment confirmation, a bit of a snafu there. Finally, JP Rifles offers a lifetime warranty to the original owner, so if it ever goes toes up due to normal use you'll get a replacement. Just don't let the battery leak, they won't cover damage due to that or abuse.
Bottomline, if your considering going to an optical sight, forget using a rail mounted sight and get the J Point. As I found out with experience, the 2 inch or greater offset created by using a rail causes convergence problems and make the gun pretty sensitive to distance. There is also the matter of trying to find a holster. It took me less than 10 minutes to cut enough clearance in my Galco OWB holsters to clear the J Point and allow the retention strap to function perfectly.
Quite simply I LOVE this sight. I also plan on getting at least 2 more, one for my 67-1 (it's already been tapped) and one for my Sig P239. However the one for the Sig will have to wait until I can get a spare slide, due to the the reciprocating motion of the slide on a semi, it's best to epoxy the mounting plate to the slide, if they aren't epoxied in place they tend to either fracture the mounting plate or damage the dovetail. Following is the link to the page for the J Point.
JP Rifles
PS; in no way to I work for JP Rifles nor have I recieved anything for this endorsement. Fact is I've paid full retail for every one purchased. In fact, they won't even know about this post unless they happen to read it. I'm only posting because it's such a superb product that it deserves some notice.
Edit note. Added a link to one image of 4 that are posted further down in this thread, scroll down and hit the thumbnails if your interested.
Last week I decided to purchase 2 more J Points, one for my 617 and one for my 620. Previously the 617 was equipped with a cheap Sightmark reflex on a rail and the 617 had the same convergence issues as the 610 with the rail mounted red dot. However, in the case of the 617 it was shooting 4.2 inches low at 25 feet when sighted for 100 feet.
As for the 620, my eyes aint what they used to be and seeing the iron sights is now not possible. Tried using readers and then I couldn't get the target in focus.
First the 617. Without the angle shim installed I couldn't get the elevation adjusted perfectly at 25 yards, ran out of adjustment with the POI 1/2 inch low. However, that was close enough to see how the sight would work at varying distances. Result, very little deviation from 20 feet to 100 feet. At most, about 7/8 inch. I've now installed a 1 degree angle shim under the sight and next week I zero it in completely.
Then the 620. This one I did get to perfect conincidence with the dot at 25 yards using 125 gr. Speer Lawman TMJ. However it was at the limit for the elevation adjustment. I could try adding a shim, however I already know the gun will shoot about 4 inches high with 158 gr. 357 Magnums. So I just may leave it as it is so I have the elevation adjustment available to tune if for Magnums.
Then I ran the target back to 35 yards and did some shooting from a sandbag rest in single action. The very first shot was on center 1/4 inch low in the red bullsye on an 8 inch shoot-n-c. Peeped the shot with my spotting scope, got excited, and threw the next shot 4 inches high and 1 inch left. Then I settled down and shot a horizontal line 1 3/4 inches long from center to center with the following 4 shots. Vertical deviation of this 5 shot string was less than 3/8 inch. IMO, the horizontal stringing was due to my needing to work on my release, I suspect a better shooter could have grouped at 3/4 inch or less. However, 35 yards is a LONG ways away for this old fart, if a gnat had bumped my on the ear it would have probably have swung that dot at least an inch. Final shot I threw high and left again, 3/4 inch to the right of that first flyer.
Finished up with some rapid fire drills at 25 feet, result was a perfectly centered 4 inch group.
Conclusions.
One is that the 2 piece barrel in the 620 is capable of astounding accuracy. It is without doubt the most accurate handgun that I have ever shot. Fact is people missed the boat on the 620, it's a freaking rifle disguised as a handgun. As we used to say when I drove a taxi to pay for college, "if you snooze you lose".
Second, the J Point Reflex is IMO the PERFECT 1 to 1 magnification optical sight for a revolver. JP Rifles offers a direct mount that uses the standard 3 hole pattern in the newer guns and it results in a sight that is only offset above the barrel axis by about 1 inch. Because of this the convergence is quite low. Depending on the caliber and it's arc, I believe that it's a setup that allows near perfect hit's from about 25 feet out to 50 yards or more. It's also a sight that allows us old farts to shoot well enough to make the young bucks sit up and take notice.
The downside is they aren't inexpensive and they are an "always on" sight. Cost is currently 299.00 and the S&W revolver mount lists at 49.95. Note, the mounting kit ships with a 1 degee wedge shim that can be reversed, so the basic mount has lots of provision for getting the elevation tuned perfectly. The case also has a rear signt notch molded into it so it can be used co-witness profided a taller fron sight is installed. On my 620 putting the standard front sight right at the bottom of the notch will get a near center hit, something useful to know should the battery die. Good news is that by keeping the cover on the one on my 610 I haven't had to replace the battery yet and haven't seen any drop in intensity in the 4 months I've had it. BTW, all mounting plates feature 4 indexing posts for the sight body so when changing the battery the zero is maintained. Also, they have a built in light sensor so using the cover puts the sight into the low intensity setting to reduce battery drain. More good news is JP Rifles ships very quickly, ordered the last 2 on a Tuesday evening and recieved them on Friday by choosing 2nd day air. However, JP Rifles has yet to email the shipment confirmation, a bit of a snafu there. Finally, JP Rifles offers a lifetime warranty to the original owner, so if it ever goes toes up due to normal use you'll get a replacement. Just don't let the battery leak, they won't cover damage due to that or abuse.
Bottomline, if your considering going to an optical sight, forget using a rail mounted sight and get the J Point. As I found out with experience, the 2 inch or greater offset created by using a rail causes convergence problems and make the gun pretty sensitive to distance. There is also the matter of trying to find a holster. It took me less than 10 minutes to cut enough clearance in my Galco OWB holsters to clear the J Point and allow the retention strap to function perfectly.
Quite simply I LOVE this sight. I also plan on getting at least 2 more, one for my 67-1 (it's already been tapped) and one for my Sig P239. However the one for the Sig will have to wait until I can get a spare slide, due to the the reciprocating motion of the slide on a semi, it's best to epoxy the mounting plate to the slide, if they aren't epoxied in place they tend to either fracture the mounting plate or damage the dovetail. Following is the link to the page for the J Point.
JP Rifles
PS; in no way to I work for JP Rifles nor have I recieved anything for this endorsement. Fact is I've paid full retail for every one purchased. In fact, they won't even know about this post unless they happen to read it. I'm only posting because it's such a superb product that it deserves some notice.
Edit note. Added a link to one image of 4 that are posted further down in this thread, scroll down and hit the thumbnails if your interested.
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