PMM FREQUENTLY ASKED QUESTIONS.
What is the difference between 360° Rotating and Locking QD mounts?
Locking: Holds QD in one of four positions
360° Rotating: Allows QD to spin freely in mount
Recommendation:
2 Point Sling: Locking front 360 Rear
1 Point Sling: Locking Rear
360° Rotating: Allows QD to spin freely in mount
Recommendation:
2 Point Sling: Locking front 360 Rear
1 Point Sling: Locking Rear
How do I remove my comp?
Comp removal is the opposite of install.
- Place comp in vice using soft jaws or other protective material like our Muschi Mounting Block or leather.
- Tighten down comp sufficiently. There should be NO movement from the comp/barrel.
- Back the slide off and angle away from the barrel flats.
- Tighten adjustable wrench to barrel flats.
- Supporting the slide with your opposite hand, slowly turn the barrel loose. This will take some strength.
- DO NOT HEAT THE BARREL, COMP, SLIDE, ETC.. YOU DO NOT NEED TO CUT THE COMP OR BARREL OFF.
- If you aren't confident/comfortable doing this, PLEASE contact us. customerservice@parkermountainmachine.com
- DO NOT HEAT THE BARREL, COMP, SLIDE, ETC.. YOU DO NOT NEED TO CUT THE COMP OR BARREL OFF.
- Remove from vice, continue loosening comp by hand until removed.
WHAT GAS JETS DO I NEED?
There is no one answer to this question, factors such as barrel length, ammunition used, suppressor, air temp/pressure and how clean the rifle is will all be factors that play into the jet size that will work for your setup. The best way to find out what size will work for you is by trial and error with a couple tests.
1. Load a full magazine for your rifle as well as one in the chamber for a total of 21 rounds(scar 17) or 31 rounds(scar 16). Fire the rifle once paying attention to the ejection and make sure the next round in the magazine is stripped and loaded into the chamber. If all looks good then move to #2
2. Now that the rifle has cycled another round, insert an empty magazine and conduct a lockback test by firing the rifle again. If both these tests have passed you can move down a jet size and start over. If your rifle has failed either of these tests, increase by a half jet size and conduct the tests again.
Scar 17 Factory jet size: 1.45mm (16" Barrel)
Scar 20 Factory jet size: 1.4mm (20" Barrel)
Scar 16 Factory jet size: 1.35mm (16" Barrel)
1. Load a full magazine for your rifle as well as one in the chamber for a total of 21 rounds(scar 17) or 31 rounds(scar 16). Fire the rifle once paying attention to the ejection and make sure the next round in the magazine is stripped and loaded into the chamber. If all looks good then move to #2
2. Now that the rifle has cycled another round, insert an empty magazine and conduct a lockback test by firing the rifle again. If both these tests have passed you can move down a jet size and start over. If your rifle has failed either of these tests, increase by a half jet size and conduct the tests again.
Scar 17 Factory jet size: 1.45mm (16" Barrel)
Scar 20 Factory jet size: 1.4mm (20" Barrel)
Scar 16 Factory jet size: 1.35mm (16" Barrel)
Below PMM Address all the nuances of the MK17 & MK20 FN SCAR Gas System
WHERE ARE MY INSTRUCTIONS?
Please check the appropriate product page, we have readily available PDF versions of our instructions to minimize the waste of paper.
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