Enlightening Range Trip Today

dflight

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Garden Bay, B.C,
Hi Folks,

Took my M305 shorty to the range today to see if I could finally get her zeroed in. I also had a new KCI mag to try out.

The new mag gave me nothing but issues, wouldn't slide into the gun smoothly at all, wouldn't engage on the tab at the front of the mag well and wouldn't latch at the back without a lot of percusive maintenance. The first round causes so much drag I had to forward assist the bolt into battery. Reloading the mag was an exercise in frustration. I'm not particularly careful about not tilting mags forward when snapping rounds in -- not a problem in the norc mags. When I reloaded the KCI mag, lower rounds would slide forward and catch on the front of the mag, binding up and preventing me from adding more rounds. My norc mags have a minimum 5.5 round capacity, KCI is just a hair over 5.

I was using a Battle Zero Target from M14.ca for sighting in and I turned off the gas system to maximize repeatability. Every time I thought I had the the adjustment I needed, (striking the line above the dot), subsequent shots would start stringing back down to the sighting dot. I tightened the knob on the left and started paying closer attention to the markings and noticed that the sights would lose two to three clicks with each shot. Adjusting back to the mark each shot finally had my groupings closer to where they should be and reasonably tight, enough that I'm at least hitting the paper out to 200 meters now. And yes, I finished the day with a couple of mags in semi-auto to get the gas system running again.

The sight is still spitting oil back at me every shot, but it isn't gushing anymore. Obviously I'm going to have to yank the sight off and clean it & grease it and reinstall it. Any advice (other than replace it, which ain't gonna happen before next year), in getting it tight and behaving properly? She'll be going on a road trip in a couple of weeks.

Of the 90 rounds (Norc steel cased) I fired today, 8 had splits at the case neck. I'm not too concerned as the bullet of an unfired round pushed into the mouth of a fired case meets a fair amount of resistance before the necks of the casings meet. I have some .308win rounds I'll run through it next session. Hungry, are you still willing to check head space from fired brass if I mail it out to ya?

The other thing I learned today (Pistol Related) is that the ejection port on a CZ SP-01 is too short to allow a spent blank cartridge to cycle out. Anybody know if Glocks or M&P 9's will cleanly eject IVI 9mm blanks?

-DF
 
Had my 2012 Long m305 out for the first time today , 100 rounds through it , two shooters . 100 % function with Norc steel cased 308 ammo . No issues with the brass splitting or excessive damage from ejection . All brass collected and inspected , strong, centered firing pin indentation , all fired primers appear normal.

2 inch group 3 shot groups were averaged , 5 shot 3 - 3 1/2 groups average , all with iron sights .

Barrel / gas system has been peened for a good lock up and alignment , a solid op rod spring guide was installed , the rest of the gun was factory stock .

:cheers:cou::cheers:
 
Hi All,

A follow up:

I took off my rear sight, wiped out the oil, greased it up per youtube and reinstalled, nice and tight and re-indexed to retain my previous zero.
Took the rifle to the range today to get some fired brass rather than steel casings for headspace measurements (Thanks again yomomma, they'll be in the mail for you tomorrow.)
The magazine definitely is trouble. It seated better today than last time, but the first round still needed a forward assist into battery. The last round failed to feed (bullet point jammed into the breach area above the chamber). I think this one's going away.

The sights are pooched, they are losing one to two clicks every shot. Anyone have a handy list of vendors for M1A (metric) replacement sights?

[ETA: New set ordered from Treeline, along with some maintenance goodies and a new spring guide - Thanks to Seafury and big bear for the pointers!)

Cheers,
-DF
 
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