A managerie of ported revolvers (and others)

I've been experimenting with porting using a mill rather than an  EDM machine.  The biggest challenge is cutting a hole so that there are no burrs inside the barrel.  There are ways to do this, but to reduce risk I've been looking for porting that allows enough clearance to deburr after if need be (possibly using a custom ground deburring tool).

So this is a collection of different porting methods for inspiration.

There's a good writeup on a ported S&W 500 at: http://www.gunblast.com/SW-500.htm

One way to deal with burrs is to bore out the barrel after cutting the ports, removing any burrs in the process. I don't think this is what they did here, but S&W has done it on other revolvers I've seen:

Some nice big ports (or is this a compensator?):

Gemini custom porting on a GP100.  I'm wondering how much velocity you lose with the ports essentially all the way down the short barrel.

Seems to be a standard configuration at Gemini: http://www.geminicustoms.com/Revolvers%20&%20Services.htm

The holes look a bit chamfered at the top:

And a final one from gemini (nice fiberoptic!)


Here's taurus' version.  They take a slice out of the barrel first:


Standard magna-port with the parallelogram slots. They use an EDM machine, so we're out of luck on stealing ideas:




Nice clean revolver (sandblasted finish?).  Again has the ports all the way down the barrel.



Interesting: row down both sides of front sight.  Usually seem to be more at an angle:



This pattern seems to be standard to taurus:


From speedshooters international.  Looks like the ports were integral to the manufacture:


Interesting article on ported shotgun: http://www.shootingtimes.com/gunsmoke/0712/index.html




Looks like magna-port, so I assume is EDM:

Interesting rifle porting from J White: http://www.jwhitegunsmithing.com/jimsrecentwork.html

This is pretty cool looking, but I have no idea if it's a good idea:

Looks like a shotgun:

Compensator with ports: http://www.dtechsuperstore.com/mili%20Guns.htm


Interestingly, seems like he's cutting with an endmill:



Another interesting set of shotgun ports  http://www.shooterssolutionsllc.com/gpage4.html



TJ custom gunworks:  http://www.tjscustomgunworks.com/Photos4/5-ports.htm
He recommended using a 4 flute endmill, but thought that nothing was going to beat EDM for cleanliness.



More shotgun porting: http://www.paladinarmory.com/Services.htm




Some big fat 1911 ports.  Should be easy to deburr even if you mess up:


And here's S&W's solution.  Port, then bore out the internals:



Vang comp shotgun porting:



Nice looking ar-15:


Interesting muzzle brake:  http://www.oneholegunworks.com/rifles/indexCompRifles.htm