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Bula Blackfeather build

This is a discussion on Bula Blackfeather build within the Gunsmithing forums, part of the M14 M1A Forum category; I'm putting a bula barreled receiver (18.5 barrel) into a black feather stock. Mostly this has been without any challenges however the trigger group is ...


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Old February 10th, 2017, 07:48 PM   #1
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Bula Blackfeather build

I'm putting a bula barreled receiver (18.5 barrel) into a black feather stock. Mostly this has been without any challenges however the trigger group is giving me problems.

I had to modify the hooks (for lack of a better term) that lock it into the receiver a bunch to get it to fit in. I couldn't lock it down otherwise and I didn't see another way of doing it.

Now that it's locking in (still nice and tight) i've got another problem the bolt seems to hang up a bit on the trigger group as it goes back I'm not sure what that's about I'm hoping I'm not screwing this up. I've got some pictures. Of the top of the trigger group. If I put the saftey on the problem goes away because it pulls down on those top most part very slighty. You can see in the picture how it's a bit boogered up. I haven't fired this gun at all.

I have very little experience and I'm relying heavily on Tony's videos. (Thanks Tony!)

Thanks for taking the time to help.
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Old February 10th, 2017, 08:12 PM   #2
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The camming lug on the left side of the hammer is a grease point. The top of the hammer can have grease applied as well.

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Old February 10th, 2017, 08:53 PM   #3
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if you want to make it a folder
http://www.brownells.com/rifle-parts...prod71553.aspx

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Old February 11th, 2017, 02:53 AM   #4
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Quote:
Originally Posted by KurtC View Post
The camming lug on the left side of the hammer is a grease point. The top of the hammer can have grease applied as well.
Exactly right.
Grease her up and let her know who is boss.

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Old February 11th, 2017, 09:13 AM   #5
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So what I'm experiencing is normal? I'm not sure it passes the tilt test.

Does what I did seem correct from my explanation?

Thanks a lot!
Steve

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Old February 11th, 2017, 09:48 AM   #6
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Originally Posted by Knife11 View Post
So what I'm experiencing is normal? I'm not sure it passes the tilt test.

Does what I did seem correct from my explanation?

Thanks a lot!
Steve
It certainly appears normal. Does the action work freely without the trigger assembly installed?

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Old February 11th, 2017, 10:33 AM   #7
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The tilt test is done WITHOUT THE TRIGGER GROUP.
If the trigger group is installed, there should be some drag/tension on the hammer when the bolt passes over it and cocks it. With SOME safeties, the hammer IS PULLED BACK a signicant amount off the sear, so less drag may be felt.

PS:
I wrote the detaled install instructions for the BLACKFEATHER chassis. I have done a few dozen BF builds and so far have not personally had to stone the trigger guard tabs ... but have read reports of a few that did.


My BF builds were done with the FORGED CHINESE receivers, which are very close to GI in exterior dimensions.

This is the first BULA / BF build I have heard of so pics and descriptions sent to Frank at M14.CA would be appreciated.
LAZ 1

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Old February 11th, 2017, 12:03 PM   #8
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Quote:
Originally Posted by Lazerus2000 View Post
The tilt test is done WITHOUT THE TRIGGER GROUP.
If the trigger group is installed, there should be some drag/tension on the hammer when the bolt passes over it and cocks it. With SOME safeties, the hammer IS PULLED BACK a signicant amount off the sear, so less drag may be felt.

PS:
I wrote the detaled install instructions for the BLACKFEATHER chassis. I have done a few dozen BF builds and so far have not personally had to stone the trigger guard tabs ... but have read reports of a few that did.


My BF builds were done with the FORGED CHINESE receivers, which are very close to GI in exterior dimensions.

This is the first BULA / BF build I have heard of so pics and descriptions sent to Frank at M14.CA would be appreciated.
LAZ 1
I will be building an all Bula blackfeather in late match. I will let you know if I come across any problems.

To the OP I would grease her up a bit and see.

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Old February 11th, 2017, 12:08 PM   #9
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I put my early James River Rockola receiver into a Blackfeather stock. The lockup was incredibly tight, and I probably pushed harder than I should have. The trigger guard hooks actually left depressions in the legs of the receiver, so it was probably too tight.

Those receivers were made by Bula, and I think the early ones had this problem. The recent Bula marked receivers have been revised to make them more correct but I don't know if this problem has been resolved.

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Old February 11th, 2017, 12:34 PM   #10
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Quote:
Originally Posted by KurtC View Post
It certainly appears normal. Does the action work freely without the trigger assembly installed?

Yes with the trigger group out it's all very free.

I'll grease it up and report back.

Thanks!

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Old February 11th, 2017, 04:07 PM   #11
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When we were finalizing the CAD files for the CNC interior machining dimensions for the Blackfeather chassis, being as we are CANADIANS, we used several of the widely available in Canada FORGED CHINESE receivers for trial fitting. I have measured several GENUINE US GI M14 receivers and even more of these forged Chinese receivers, and found the Chinese were very close and consistent with GI external dimensions. We also used ONE SAI M1A CAST receiver for fitting, but given the WIDE variations in the decades long production runs of CAST SAI receivers, we did not allow for all the variations. Plus, here in Canada, many of the other brands of M14 type receivers, cast or forged, are too rare to be significant.

So what we did was create a final prototype test fixture, and send it to the US for passing around between several testers with different brands of receivers. And got feedback from our elite team of "crash test dummies". And we confirmed that THERE ARE VARIATIONS in receiver fit amongst different brands and different lots within brands.... leg length, width, right side details, etc.

Ideally, we wanted to achieve the tightest fit with the widest range of receivers ... which involves two almost mutually exclusive goals. With TIGHT being the over riding concern. And, with actual user feedback from hundreds of customers, it seems we did a pretty good job. Very few complaints of "Too Tight", which usually can be adjusted with a bit of FINE metal removal on the trigger guard lugs, or else swapping in a different trigger guard. Or very rarely, with a bit of adjustment to the receiver legs.

We do NOT recommend removing material from the chassis.

First of all,
since the BF chassis is carefully dimensioned to fit GI or close to GI spec receivers, it makes more sense to modify the out of spec receivers to conform.

Second,
removing material from inside the alloy chassis is not as convenient as removing material from the outside of the steel receiver. And cutting through the hard surface of the alloy anodising may result in a soft, easily peened spot. Even given the often very hard exterior finish of the heat treated receiver, it is easier to get controlled and consistent results on the receiver. If the legs are too wide, best place to remove steel is from the FRONT, and leave the recoil surfaces at the rear alone. A COARSE stone and PATIENCE us advised.
DREMEL is a dirty word here.

Just a bit of BF fitting advice from a guy who has
BTDT a few times.
LAZ 1
(;-)

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