Added an RMR to my FN 5.7 Pistol. But I have a question, too.

[CDR_Glock]

Having an extra RMR I wanted to see how this performed. I have used red dot sights on my 5.7. Well, the newer design just requires removal of the rear sight.


Tools I needed:

Precision mallet

1/16 punch to remove the pin

Flat head screwdriver

Blue Locktite

Bench vise to compress the roll pin.

3/32 roll pin punch

Lots of oil


The easiest part is removing the rear sight. Use a 1/16 punch to remove the pin. Screwdriver to remove the rear sight.

Screwdriver to attach the mount. Then, I tried to punch the roll pin without compressing. That didn't work. I used the bench vise to compress the roll pin. Then I used a 3/32 punch and gently tapped it through.

Blue Locktite to secure the RMR to the mount.



I set up the RMR for 25 yards. Was able to shoot it out to 50 yards very easily. It's a flat shooter even at 75 yards. I was able to hit 150 yard plates, also, with a slight holdover. With the RMR the target acquisition it fast, and it is consistent. No issues with reliability with the gun at all. Not with an RMR. I used SS197.



I'll tell you that ASTIGMATISM is the major limiting condition that may hinder your ability using a red dot/reflex sight.

My question is this: Have any of you used this to hunt, in a self defense situation or any other in vivo application aside from steel and paper?

 

[browningguy]

I've used my 5.7 carbine to shoot quite a few varmints, works well on small stuff, haven't tried it on anything as big as a coyote though.

 

[Varminterror]

Are you asking if anyone has specifically used an RMR on a Five7 for hunting, used an RMR, or used a Five7? I've not used the combination, but have used both individually.

So to your question, "have any of you ever used this to hunt...?" for me to answer - what is "this," because if it is either of the RMR or 5.7, then yes, I have. If "this" is both together, then I have not.

So what's the real question? Or what concern do you have?

 

[CDR_Glock]

Are you asking if anyone has specifically used an RMR on a Five7 for hunting, used an RMR, or used a Five7? I've not used the combination, but have used both individually.

So to your question, "have any of you ever used this to hunt...?" for me to answer - what is "this," because if it is either of the RMR or 5.7, then yes, I have. If "this" is both together, then I have not.

So what's the real question? Or what concern do you have?

The question is what animal or living creature have you shot with an FN 5.7 pistol (not using the RMR, I mean)?

 

[ClickClickD'oh]

I have shot many pigs with my Five-Seven with a Burris Fastfire 3 on the Fivesevenreddot mount, which is what it looks like you are using. A red dot sight on a Five-Seven is pretty much the next thing to cheating IMHO... not that I'm complaining.

 

[CDR_Glock]

I have shot many pigs with my Five-Seven with a Burris Fastfire 3 on the Fivesevenreddot mount, which is what it looks like you are using. A red dot sight on a Five-Seven is pretty much the next thing to cheating IMHO... not that I'm complaining.

It's so much easier for target acquisition. I have been accustomed to red dots for 6 years, now.

The sight I have is a Trijicon RMR Dual Illumination.

I have some Burris sights in my Shotguns.

 

[Varminterror]

I'm a bit of an eccentric type when it comes to handgun hunting, so that was my intent when I picked up the Five7 - hunting.

For small game, the 5.7 does what a guy should realistically expect, which means expectations can't be very high. It's a lightweight bullet at relatively modest velocities - impressive speed for a handgun, but equally unimpressive bullet weights. It's a bit more potent for coyotes than a 17HMR or 22 WMR - where either of the rimfires might be well employed out to 75yrds or so, the 5.7 hangs on to around a hundred yards. Different, but just so, and really only with the 40grn load, if it shoots well in your Five7. Comparatively, I was getting as much performance out of a Taurus Raging Hornet 22 Hornet, and nearly the same field capability with a 17HMR Tracker, 22M Single Six or PMR30- both of which had cheaper and more readily available ammo. The 32H&R, 327FM, and 357sig are also options I had at hand, which also sport a similar serviceable range for hunting of these smaller game animals - with a much deeper trajectory, of course. So I ultimately sold mine off, and the P90 I had with it. For bunnies, it's impressive, but messy, just as the others mentioned above can be.

Brass supply for the 5.7 isn't great, but a guy can live with it if you're not doing too much shooting, or if you live on a square range. For me, the brass flinging Five7 was frustrating, as I was pretty invested in the brass, so in hunting fields, it was hard to enjoy the pistol, knowing I'd have to choose to lose the brass, or waste time searching for it. Much easier to employ one of the wheelguns mentioned above, or the PMR30. I don't really care for surplus ammo in any flavor, so ammo cost was higher against the rimfires, OR lost brass was more expensive to trump some of the value gained by reloading.

I don't buy into the philosophy of the 5.7x28 for defensive use absent of body armour, so that application had no interest to me.

So I bailed on mine for logistic reasons - I could nearly match the performance with these other handguns I already owned, and none of the others came with as much brass or ammo frustration, nor the same high price tag of the Five7. I'm a wheelgunner at heart, so that set me up for a bias. I'll buy another one some day just to say I have it, but it's low on my priority list.

It's light for coyotes, there's no lying about that, especially in the lighter loads. The 40grn load obviously kills the bigger game better than the 27's. I'm sure it would be a fine hounded hog pistol as well, and would equally do well on baited hogs in close cover, as long as you were particularly persnickety with shot placement - the "low behind the ear shot" or nothing, and only at short ranges. For bunnies and squirrels, it's satisfyingly overpowered, but that's kinda the point. I never found the sweet spot with either the 20 somethings or the 40's to keep it from tearing up called raccoons, so I really reserved it for coyotes which were big enough to soak up that energy, or smaller game meant for the stew pot, and NOT meant for the fur auction. It's a VERY flat shooting pistol, which is remarkable, and it makes killing small game at ranges a guy would call "damned long for pistols" much easier.

You'll tear it up with that RMR on top. It's not a 600yrd deer pistol, but with realistic expectations and a good supply of ammo or brass, it's a hoot on small game.

 

[CDR_Glock]

I'm a bit of an eccentric type when it comes to handgun hunting, so that was my intent when I picked up the Five7 - hunting.

For small game, the 5.7 does what a guy should realistically expect, which means expectations can't be very high. It's a lightweight bullet at relatively modest velocities - impressive speed for a handgun, but equally unimpressive bullet weights. It's a bit more potent for coyotes than a 17HMR or 22 WMR - where either of the rimfires might be well employed out to 75yrds or so, the 5.7 hangs on to around a hundred yards. Different, but just so, and really only with the 40grn load, if it shoots well in your Five7. Comparatively, I was getting as much performance out of a Taurus Raging Hornet 22 Hornet, and nearly the same field capability with a 17HMR Tracker, 22M Single Six or PMR30- both of which had cheaper and more readily available ammo. The 32H&R, 327FM, and 357sig are also options I had at hand, which also sport a similar serviceable range for hunting of these smaller game animals - with a much deeper trajectory, of course. So I ultimately sold mine off, and the P90 I had with it. For bunnies, it's impressive, but messy, just as the others mentioned above can be.

Brass supply for the 5.7 isn't great, but a guy can live with it if you're not doing too much shooting, or if you live on a square range. For me, the brass flinging Five7 was frustrating, as I was pretty invested in the brass, so in hunting fields, it was hard to enjoy the pistol, knowing I'd have to choose to lose the brass, or waste time searching for it. Much easier to employ one of the wheelguns mentioned above, or the PMR30. I don't really care for surplus ammo in any flavor, so ammo cost was higher against the rimfires, OR lost brass was more expensive to trump some of the value gained by reloading.

I don't buy into the philosophy of the 5.7x28 for defensive use absent of body armour, so that application had no interest to me.

So I bailed on mine for logistic reasons - I could nearly match the performance with these other handguns I already owned, and none of the others came with as much brass or ammo frustration, nor the same high price tag of the Five7. I'm a wheelgunner at heart, so that set me up for a bias. I'll buy another one some day just to say I have it, but it's low on my priority list.

It's light for coyotes, there's no lying about that, especially in the lighter loads. The 40grn load obviously kills the bigger game better than the 27's. I'm sure it would be a fine hounded hog pistol as well, and would equally do well on baited hogs in close cover, as long as you were particularly persnickety with shot placement - the "low behind the ear shot" or nothing, and only at short ranges. For bunnies and squirrels, it's satisfyingly overpowered, but that's kinda the point. I never found the sweet spot with either the 20 somethings or the 40's to keep it from tearing up called raccoons, so I really reserved it for coyotes which were big enough to soak up that energy, or smaller game meant for the stew pot, and NOT meant for the fur auction. It's a VERY flat shooting pistol, which is remarkable, and it makes killing small game at ranges a guy would call "damned long for pistols" much easier.

You'll tear it up with that RMR on top. It's not a 600yrd deer pistol, but with realistic expectations and a good supply of ammo or brass, it's a hoot on small game.

Thanks. That is exactly, the kind of information I was looking for.

I still wonder about effectiveness for SD. I do understand its intended initial purpose.

 

[Varminterror]

I still wonder about effectiveness for SD.

Against body armour, the high velocity, light bullet paradigm works. Absent of body armour, the 9mm Para hits a lot harder.

 

[MachIVshooter]

My money says it will shear the screw or pin in relatively short order. There's a reason we cut slides to fit mini reflex sights, and it's not because it's easier than just drilling and tapping.

 

[CDR_Glock]

My money says it will shear the screw or pin in relatively short order. There's a reason we cut slides to fit mini reflex sights, and it's not because it's easier than just drilling and tapping.

You brought up an interesting point. Roll pins are pretty stout, though. If anything that screw MIGHT strip. I did Loktite it. Given that it is not much recoil, it will be interesting how long the setup lasts, though. Given your line of work, I believe you are probably right.

 

[MachIVshooter]

You brought up an interesting point. Roll pins are pretty stout, though. If anything that screw MIGHT strip. I did Loktite it. Given that it is not much recoil, it will be interesting how long the setup lasts, though. Given your line of work, I believe you are probably right.

The felt recoil is irrelevant; it's slide velocity, inertia, momentum. The lightweight slide and straight blowback action of the Five-seveN means it likely has a higher slide velocity than most locked breech guns in service calibers, since it has the same bolt thrust as 9x19mm. That sudden stop when bolts/slides reach the end of their travel is violent.

I suppose time will tell, and if it does rip out or snap, you can always just do an actual RMR cut. RMR itself is tough, should survive if it does come off. Do make sure everything stays tight; a loose pin or screw will exacerbate the situation.

 

[Varminterror]

I haven't given the math any thought, but I did run an RMR on a non-milled glock for several thousand rounds, in a mount which replaced the rear sight, and were only anchored to the dovetail "spud" by two screws.

I've also used a Jpoint mount on a Ruger Super Redhawk in 454C and SBH 44mag with 300grn bullets at 1325fps for many hundred rounds. These only use the rear sight screw as their mounting support.

Might be worth the mental exercise to go through the comparison of momentum in these examples. I never gave it any thought after purchase - I've generally trusted if I buy mounts from reputable manufacturers, and communicate with them prior to purchase to ensure the testing rigors were up to the task for which I'd employ them, I can iron out whether their gear will hold up, or not.

 

[ClickClickD'oh]

Sigh... no, you can't mill an RMR cut into a Five-Seven. This is one of those, "how you know someone isn't familiar with the Five-Seven platform" moments.

 

[CDR_Glock]

This raises the quest of a Glock MOS. The optic is screwed into the plate. Same goes for The S&W M&P CORE. I've never read of those failing.

 

[Danoobie]

The question is what animal or living creature have you shot with an FN 5.7 pistol (not using the RMR, I mean)?

This came up before, somewhere. Put down a large possum and a couple wild dogs. They all went down fast, and
died quickly.