And I was expecting to see a lot more explanations here. What you wrote are just the headlines. I knew some things you did to my gun, but the details would be more interesting b/c you never talked at large about it.
You are a PITA. You always want something.
Here are some things (I can't do more detailed than that).
Re-crowning job. Just a touch to make sure I will not have
crown problems affecting accuracy.
I will not go into details concerning the specifics
of crowning a chrome-lined barrel or preferred angles.
The crown used on this was made
by a very gentle touch with the cutter and
a minor lapping after that.
Also, a thread was cut at the muzzle and an AR flash hider installed.
Trigger job. The regular semi-automatic trigger on 97
is very hard to modify or improve (as in “trigger job”).
A friend from US (Jason F) did 5 attempts in 5 different ways
(unfortunately on 3 different rifles)
to have a more bearable trigger for target purposes.
I have shot all 5, but I am familiar with only a couple of them.
The one used here is the trigger job
obtained in Jason’s attempt #2.
The trigger mechanism itself has all original parts,
some modified, plus few extra parts
(one pin, 2 springs, 2 shims, few set screws),
Also, there are some additional parts made and installed
in order to have the push-rod adjustable.
It has a much reduced and smooth take-up (adjustable),
the over travel is completely eliminated by adjustment (it is adjustable),
it breaks at 2.7 lbs (not adjustable by user), and it feels pretty crisp.
I wish it had a modded trigger shape like #3 and #4.
It still holds and feels good after 12k shots (or about)
that it has on 2 rifles.
None of the Jason’s trigger jobs retain the safety feature
(they fire on “safe”), as I told him from the beginning
not to bother with the safety.
He is still working on refining #5 trigger.
In testing and after that, we did not experience
bump fire, slam fire, FA fire or any kind of weird fire
that I read about in these threads.
Speaking of which, I cannot see how the fcuk
is the factory 97 bump-firing,
knowing that it has that HUGE take-up (at least on the ones I fired),
unless of course, somebody tried to do stupid things
without knowing what he is doing.
Also, without the whole story, I call the full-auto rumor plain BS.
Ammo.All the ammo was developed by a friend.
It started by him giving me samples of ammo
left from testing a prototype AR. Some did good, some didn’t.
Each sample was about 200-800 rnds each.
And it ended by fine-adjusting the load at the range
He was loading 5 to 10 rnds in his van in the range parking lot,
chrono the shots and registering the results of my shooting.
It took a lot of work. Days in a row.
The best results are based on a load with low velocity and 62gr. bullet.
The ammo used was the most significant single factor in
achieving accurate shooting results.
He did not tell me the receipe and i did not ask
since I don't have any intention to reload 223.
However I'd love to find an affordable ready-ammo with similar results.
We also tried some other things on the rifle to see
if there is any influence on the accuracy.
Here are the results:
-Gas block adjustment: not significant.
-Mass at the muzzle (different muzzle devices, the heaviest was
a noveske flash hider): not significant in accuracy results.
-Recoil spring tension: we did not mess enough with it to see that.
-Cleaning : probably significant,
but we always cleaned and lubed religiously,
as the gun was borrowed.
Cleaning materials must be aluminum compatible
(no Hoppe’s No.9 or such).
Mags: 3 mags of 5 rnds, steel body,
with matched and proven follower.
In addition, as back-up, 1 10-shot pistol mag
and 1 10-shot AR mag pinned to 5, never used nor proven.
