Porting a P45

[ruchik]

Has anyone ever tried Mag-na-porting a P45? If anyone has, was there any noticeable difference?

[ruchik]

Nobody??? There has to be someone who has thought along the same lines as me, I was hoping I could get a report on how the recoil is before and after the porting.

[Bawanna]

I don't recall anyone here ever porting a P45.

Several 9's and 40's. I've been contemplating porting my PM45 not that it needs it, I just think it looks cool and can't hurt anything.

I ported my K40 and it knocked the edge off, it's still a fire breathing dragon but noticeably better.

I say go forth and be our Columbus and then we'll all know. Magna Port is fast and they do a real nice clean job. I can't see any negatives to doing it.
Some just don't care for it for a variety of reasons, the flash (never noticed it on mine), gases in the eyes in close quarters, catching clothing on fire if you shoot from a pocket.
None of those issues bother me in the slightest.

Go forth Columbus and break trail. I'll follow with my PM45 when I get the marbles.

[ruchik]

Sounds good! I'll be back with a report in a few weeks.

....but I'd still love to hear a firsthand account :-)

[CJB]

I think you'll find that, all other things being about the same, porting a 45 is less effective than porting a 9mm or 40cal.

The reason being the gas pressure, which results in ejecta velocity through the port. The port effectively becomes an inefficient rocket nozzle, providing thrust at a certain angle in order to offset the effects of barrel flip and to reduce the effect of the gas leaving the bore itself, by lowering the pressure at that point.

It has been proven, both mathematically and through empirical testing with elaborate fixtures and live fire, that approximately 40 percent of the recoil of a .30-06 is from the rocket nozzle effect as the gas behind the bullet leaves the bore. If that gas could be diverted, or could have its pressure lowered, the "rocket nozzle effect" would be greatly reduced.

If the gas could be fully diverted, and instead of leaving the bore, it could be directed through efficient nozzles, pointing in a rearward direction, by balancing the system, one could achieve zero recoil. That is exactly what Col. Rene Studler did, when he devised the recoilless rifle. Part of the expanding gas from firing was diverted rearward through several highly efficient nozzles, with the effect that a highly accurate 75mm shell could be fired from the shoulder, with no almost no rearward recoil. In fact as the nozzles wore, the effect was to produce forward recoil!

And such it is with Mag-Na-Porting. The diversion of gas is made through inefficient nozzles, but its enough to tame a lot of barrel flip. The higher gas pressures of the 9's and 40's mean higher thrust at those points, and better flip control.

I say - go for it! I'm with Bawanna on this... it looks cool.

Jocko likes his ported PM9(j) model.

[MikeyKahr]

I think you'll find that, all other things being about the same, porting a 45 is less effective than porting a 9mm or 40cal.

The reason being the gas pressure, which results in ejecta velocity through the port. The port effectively becomes an inefficient rocket nozzle, providing thrust at a certain angle in order to offset the effects of barrel flip and to reduce the effect of the gas leaving the bore itself, by lowering the pressure at that point.

It has been proven, both mathematically and through empirical testing with elaborate fixtures and live fire, that approximately 40 percent of the recoil of a .30-06 is from the rocket nozzle effect as the gas behind the bullet leaves the bore. If that gas could be diverted, or could have its pressure lowered, the "rocket nozzle effect" would be greatly reduced.

If the gas could be fully diverted, and instead of leaving the bore, it could be directed through efficient nozzles, pointing in a rearward direction, by balancing the system, one could achieve zero recoil. That is exactly what Col. Rene Studler did, when he devised the recoilless rifle. Part of the expanding gas from firing was diverted rearward through several highly efficient nozzles, with the effect that a highly accurate 75mm shell could be fired from the shoulder, with no almost no rearward recoil. In fact as the nozzles wore, the effect was to produce forward recoil!

And such it is with Mag-Na-Porting. The diversion of gas is made through inefficient nozzles, but its enough to tame a lot of barrel flip. The higher gas pressures of the 9's and 40's mean higher thrust at those points, and better flip control.

I say - go for it! I'm with Bawanna on this... it looks cool.

Jocko likes his ported PM9(j) model.

The last sentence alone would have been sufficient CJB. :rolleyes:

[Barth]

I think you'll find that, all other things being about the same, porting a 45 is less effective than porting a 9mm or 40cal.

The reason being the gas pressure, which results in ejecta velocity through the port. The port effectively becomes an inefficient rocket nozzle, providing thrust at a certain angle in order to offset the effects of barrel flip and to reduce the effect of the gas leaving the bore itself, by lowering the pressure at that point.

It has been proven, both mathematically and through empirical testing with elaborate fixtures and live fire, that approximately 40 percent of the recoil of a .30-06 is from the rocket nozzle effect as the gas behind the bullet leaves the bore. If that gas could be diverted, or could have its pressure lowered, the "rocket nozzle effect" would be greatly reduced.

If the gas could be fully diverted, and instead of leaving the bore, it could be directed through efficient nozzles, pointing in a rearward direction, by balancing the system, one could achieve zero recoil. That is exactly what Col. Rene Studler did, when he devised the recoilless rifle. Part of the expanding gas from firing was diverted rearward through several highly efficient nozzles, with the effect that a highly accurate 75mm shell could be fired from the shoulder, with no almost no rearward recoil. In fact as the nozzles wore, the effect was to produce forward recoil!

And such it is with Mag-Na-Porting. The diversion of gas is made through inefficient nozzles, but its enough to tame a lot of barrel flip. The higher gas pressures of the 9's and 40's mean higher thrust at those points, and better flip control.

I say - go for it! I'm with Bawanna on this... it looks cool.

Jocko likes his ported PM9(j) model.

+1
I have extended dual ported Storm Lake barrels in my Glock G27-357 Sig 4.16" and Sig Sauer P220/45 5.10".

In my hands, the felt recoil is noticeably reduced in the high pressure, high velocity, 357 Sig.
But there is no noticeable reduction in felt recoil, for me, with the sub sonic 45.
Both barrels appear to reduce muzzle rise though.

Opinions vary wildly on the effectiveness of porting.
As Jocko likes to say - I'm just saying...

[jocko]

Never shot a kahr 45 but IMO a ported polymer 45 kahr has to be of some benefit. Maybe not as noticeable as u guys stated but it is doing something. Just sounds to me like the kahr 45's are comfortable and pleasant to shoot. Gosh, oh gee, I wish I had a kahr polyjmer 45!!!! Just sayin

Felt recoil is definitely different for every person...

[JFootin]

Never shot a kahr 45 but IMO a ported polymer 45 kahr has to be of some benefit. Maybe not as noticeable as u guys stated but it is doing something. Just sounds to me like the kahr 45's are comfortable and pleasant to shoot. Gosh, oh gee, I wish I had a kahr polyjmer 45!!!! Just sayin

Felt recoil is definitely different for every person...

Bawanna, he said it! :eek: I think you have converted him! :D

[jlottmc]

HOLY **** BATMAN!!!!! I think the time has finally come, I may find a CW to send him for that.

[jocko]

no doubt u guys are dummer than a box of rocks with that statement of mine, but thats OK, send the fokkers. send lots of them. I am having a yard sale the end of the month, so get with it. It is a nice gun for really old old men. Just sayin. I hear they are a favorite with goldwiners to, that in itself outta tell u sumptin..

[jlottmc]

That's it. Old man you can expect to find a yamaha in your garage.

[jocko]

oh goody, another yard sale item!!! Just sayin

[Bawanna]

Don't make me come down there you two.

[jocko]

he insulted me GREAT ONE. Ban him ceasar!!!! Just sayin

[ruchik]

Back on topic: I am correct in assuming yhen, that using higher pressure loads increase the effectiveness of the porting?

[JERRY]

i had my S&W 640 .357 Magna-Ported, it cut the muzzle flip, torque and rise by half in my estimation....its like shooting a +p .38spl now.....i dont know how it will work with a semi-auto but in a revolver they made a believer out of me.