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Old 08-19-2019, 07:27 PM

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The MKIV's Seen to have tight Chambers. I recommend using a 22 mop brush end and some mothers Polishing Compound chucked in a drill. Only polishing the chamber area.

This should take no more than 60 seconds or so.
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Old 09-08-2019, 11:29 AM
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I've probably got 6 or 700 rounds through my Lite and the only failures have been ammo-misfires from Federal bulk. 4 different magazines-all flawless.
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Old 09-08-2019, 12:43 PM
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The secret to a reliable Mk IV.
Clean it when needed.
Good ammo.
Good lube.

I don't use anything from Remington, Winchester, or Federal. For steel matches CCI Blazer or Mini Mag.
NRL 22, long range, benchrest, or bullseye. SK+ or better depending on application (CCI SV is to inconcensent velocity wise that hurts accuray).

(Now I will put my flame suit on.) I use TW25B for lube. Remington dry lube does not reduce friction as well as a good grease or oil. I have proved this time and again a heavy coat or a light coat and any place in between I get stoppages with SV ammo.High speed it works. This is in 10-22s and Mk IVs

The only match you can call an alibi is bullseye any other type of match you move closer to last if your gun chokes.

There certain parts and things that can be done to improve reliability if needed but first the basics need to be covered.

Last edited by JHB51; 09-08-2019 at 04:49 PM.
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Old 09-08-2019, 04:17 PM
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I now have 37000 rounds through my Mark IV 22/45 and after the initial break in and tuning my magazines it runs like a Swiss Watch. I use CCI-SV or Eley Practice for most of my shooting and no failures. I can't afford one during a Steel Challenge match.

My back-up 22/45 only has about 8000 rounds through it. I use the same magazines in both guns and there is a no failure rate on this gun as well. I mostly use CCI Blazer in this gun. I'm cheap. The Blazers actually produce better groups and I'm starting to use in the Mamba.
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