Porting a barrel

jabberjaw112

jabberjaw112

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Evening Gents;
So I've adapted my rifle's dust cover to take a scope 1/4" above the steel. Short scope so I can use stripper clips. Using bolt and spring buffers. Notice a barrel jump that hinders a second shot. I want to port the barrel a 1/2 " behind the the stock sight and 1/4 " in front of the sight. I still would like to drop a pill at 200 yrds and fill the freezer. Is this a realistic idea?.
Thanks always
 
Pretty much the same as inner city......it seems that I was unclear as to what I was asking.
Will porting the barrel in the final 3/4 of an inch affect the balistcs for a 200yard shot.
 
The Ag42B rifles are ported. There's about 30 holes in the barrel. They are there to manage the recoil they have nothing to do with nor affect the ballistics. Ballistics is the trajectory of the bullet.
If you want to pay a gunsmith to set up to do this properly you're looking at spending way over the $200 the rifle is worth.
Or
you could buy a $50 muzzle brake that tames the Recoil the same way.

If you're planning on Bubbaing this together your self good luck with your endeavor, Brownells sells jigs to port shotguns and they are close to $300 USD.
 
Thanks Innercity for that. I was planning 6 ports,3 per side, 10 degrees off centre.Before drilling, I will fill the barrel with a wood Dowell,using a drillpress. Recoil isn't a issue
 
If the recoil is no issue, why port the barrel? You shouldn't need the quick follow up shot you mentioned to fill your freezer if you were hunting within the limits of your gun. Counting the dust cover scope, that's 3 stupid ideas.
 
Innercity said:
The Ag42B rifles are ported. There's about 30 holes in the barrel. They are there to manage the recoil they have nothing to do with nor affect the ballistics. Ballistics is the trajectory of the bullet.
If you want to pay a gunsmith to set up to do this properly you're looking at spending way over the $200 the rifle is worth.
Or
you could buy a $50 muzzle brake that tames the Recoil the same way.

If you're planning on Bubbaing this together your self good luck with your endeavor, Brownells sells jigs to port shotguns and they are close to $300 USD.
Click to expand...

porting to reduce muzzle jump is routinely done to shotguns and pistols.
The Mag-na-port process was developed in the USA by Mr. Larry Kelly who used simple physics combined with his 30 years experience in E.D.M (Electrical Discharge Machining) technology and lifetime knowledge of firearms to develop a method of reducing recoil and muzzle jump. Using trapezoid shaped ports to aim exhaust up from the top of a gun barrel, the muzzle pressure is reduced.
Click to expand...

There are two stages of perceived recoil when a shotgun is fired:the first is the result of primary ignition and the second the consequence of expanded propellant burn-off at the muzzle.The ports dissipate shock and because of their design and placement, redirect muzzle energy to dramatically reduce muzzle lift.For the shooter, this translates into a reduction of perceived recoil of 15 to 20% and 40 to 60% less muzzle jump.
Click to expand...
 
Hopefully, with the reduced muzzle jump, I can double tap into the shoulder with less meat wastage. even so, ground with, heavy garlic abates the blood taste
 
jabberjaw112 said:
Evening Gents;
So I've adapted my rifle's dust cover to take a scope 1/4" above the steel. Short scope so I can use stripper clips. Using bolt and spring buffers. Notice a barrel jump that hinders a second shot. I want to port the barrel a 1/2 " behind the the stock sight and 1/4 " in front of the sight. I still would like to drop a pill at 200 yrds and fill the freezer. Is this a realistic idea?.
Thanks always
Click to expand...

I have a muzzle brake/compensator on my rec7 that uses set screws to choose where to direct the gasses that are venting off. It took me several tries of different positions to get it to track straight.

Drill your barrel if you want, but you may not get the result your hoping for. Also, what are you going to do about the burrs that will form on the inside on the barrel as the bit breaks through the metal?? Without barrel making gear to redo the rifling, it's gonna be ugly. I'm pretty sure metal burrs will be somewhat prohibitive in your goal of an accurate shot at any range....
 
1. Electron Discharge Machining. An shaped electrode erodes through the barrel while it is submerged in a bath of electrolyte. MagnaPort used to offer this service. Beautiful clean ports.
2. This process is often used when brakes are integral with the barrel. Running in the reamer removes burrs. Brakes are invariably smoothbore, whether integral or added on. With the exception of EDM.
 
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