Open Gun - 40 Pro Ported SKU10100 - MP-Pistol Forum

Open Gun - 40 Pro Ported SKU10100

This is a discussion on Open Gun - 40 Pro Ported SKU10100 within the Competition forums, part of the Shooting category; Looking at building an Open gun in the spring using the M&P 40 Pro Ported. I have not shot the ported gun and am wondering ...

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Old November 27th, 2014, 07:07 AM   #1
Join Date: Jun 2012
Location: Terrace, BC
Posts: 182
Open Gun - 40 Pro Ported SKU10100

Looking at building an Open gun in the spring using the M&P 40 Pro Ported. I have not shot the ported gun and am wondering if it provides enough downward pressure on firing to offset the recoil and act like a compensater on an Open

I am thinking 40 cal would be easier to make major.

I should add we are limited to 10 rounds in CANADA when we play IPSC so the capacity issue is a wash between the 40cal and the 9MM.

Has anyone tried this?

Take Care


Last edited by Canuck44; November 27th, 2014 at 07:29 AM.
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Old December 4th, 2014, 03:26 PM   #2
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Join Date: Feb 2014
Location: Sauk Rapids, MN
Posts: 54
Just started to make my first USPSA Limited/Open gun. I am starting out with the Pro CORE in 40. In the 5 inch variety. JUst installed a Apex Flat trigger kit and will be changing out some of the springs to lighten the trigger pull. Have the RAM on order.. Just ordered magwell and base plates to fit the magwell. I have a Burris Fastfire Red Dot currently on board but will probably remove it and run iron sights first. Thinking of a barrel upgrade also.
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Old June 24th, 2015, 05:08 AM   #3
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Location: Fort Lauderdale, FL
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I am using the CORE Ported 9L. The current "barrel porting" is venting off about 12-15% of your muzzle blast to push your muzzle down. (For every action there is an equal and opposite re-action) When using porting the recoil is slightly reduced and your control of the muzzle is more manageable.

When using a compensator, the principles are more exaggerated. The gases out of the muzzle, which is peaking into the first expansion chamber, will be diverted upward, bleeding off 30% of the recoil whereas the next port will bleed off another 5%, then the third with 5% and the forth if used, will be about 5%. More than 4 ports on a compensator do not make any significant differences. Bottomline, a compensator will reduce your recoil by 40-45%. Much more dramatic. This also however changes the dynamics and new recoil springs and hotter loads may need to be looked at to drive the slide weight properly if so much of the gas used to cycle the weapon is being blown off.

Check out my video series I just started on my S&W M&P Open Gun

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