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Feed Issues, Rock-ola James River Armory

This is a discussion on Feed Issues, Rock-ola James River Armory within the Modern M14 forums, part of the M14 M1A Forum category; masspatriot, I beg you, please put the original spring guide back in and fire some rounds to eliminate that variable since the spring guide and ...


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Old June 2nd, 2017, 08:03 PM   #76
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masspatriot,

I beg you, please put the original spring guide back in and fire some rounds to eliminate that variable since the spring guide and spring were the last items and were changed out together. That should tell us for sure if the spring or spring guide was the cause.

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Old June 3rd, 2017, 02:11 AM   #77
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Originally Posted by Redneck Yankee View Post
For am amateur like me it sounds like the problem is still an unknown; whether it was the firing pin, firing pin bolt combo, or op rod spring. It doesn't seem to answer the question of whether a GI bolt assembly can be used in a Bula receiver, or whether the GI bolt can if the FP is modified. On the flip side, it seems like Bula bolts can be used in non-Bula receivers without issue (?)
My mostly Winchester build uses a Bula/James River receiver and a Winny bolt with USGI internals and Winchester barrel. They work together perfectly with a headspace of 1.633 and lug contact was fine on both sides with no lapping, other that just checking for initial fit. Stop by and check it out Rick.



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Old June 3rd, 2017, 05:09 AM   #78
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Is the headspace a variable that could affect whether a USGI bolt works in a Bula, ie, whether the headspace is 1.6315 (such as mine) vs 1.633. So one would only have to be particular in the headspace used on a Bula receiver?

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Old June 3rd, 2017, 05:37 AM   #79
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Quote:
Originally Posted by Dougboffl View Post
masspatriot,

I beg you, please put the original spring guide back in and fire some rounds to eliminate that variable since the spring guide and spring were the last items and were changed out together. That should tell us for sure if the spring or spring guide was the cause.
I will do that soon. I am curious as well. Also is there a possibilty that the new firing pin may get mangled with continued firing? Was it the victim??
Need to order more ammo. The saga contines.

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Old June 3rd, 2017, 05:43 AM   #80
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Originally Posted by Redneck Yankee View Post
Is the headspace a variable that could affect whether a USGI bolt works in a Bula, ie, whether the headspace is 1.6315 (such as mine) vs 1.633. So one would only have to be particular in the headspace used on a Bula receiver?
Not at all. The headspace of 1.633 without needing adjustments indicates that Bula products are comperable to USGI spec. When using a chrome lined barrel it is general practice not to ream for headspace. Some lap the bolt to their receivers to set headspace. Others that use barrels that are not chrome lined, more common, are usually short chambered meaning that they are a few thousandths under where the desired headspace needs to be use a reamer to set headspace by cutting the barrel internally. Some like 1.630, very tight others a little more. I prefer keeping my headspace closer to NATO spec.
One should always be aware of headspace no matter what brand receiver is used. I have just found that Bula Defense Systems are one of the easiest to work with.




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Last edited by nf1e; June 3rd, 2017 at 02:24 PM.
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Old June 4th, 2017, 05:50 AM   #81
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What is involved in checking headspace?

I am open to learning more. I don't mind investing in tools, unless someone has whatever is needed that i can rent. Not sure what the investment would be.
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Old June 4th, 2017, 06:34 AM   #82
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Hi Mass,
I was finally able to view your video. It is definitely the retraction cam and it's location. It is too far rearward and the angled cut needs to be advanced toward the front of the receiver. It is the surface contacting the right side of the firing pin tail from the shooters position.

It will void your warranty if you do it yourself, but if you fix it, who cares? You need a specially shaped saucer stone to do it though, and a really good tool like a Foredom, not dremel or other high rpm tool. Must be a variable speed controlled unit.

The combination of an over powered op rod spring and the mis-located retraction cam caused your problems. You have to get all that grease off the bottom of the bolt too. It transfers to the cartridge case and can actually cause rounds hanging up in the chamber too.

I highly recommend you send the rifle back to wherever you got it from. Sorry, but that is the only way to make sure you don't get a warranty slap in the face.

If the receiver bridge is mis-located in the receiver altogether, (common among some commercial makers) and we don't know that yet, it would also cause the retraction cam to be mis-located. A badly located bridge is a bad thing because it is what stops out of battery detonations, and if it is merely the cam that is off, not so bad. Fixing either yourself is risky as pertains to warranty and exclusions.

I don't know if you have calipers but the back edge of the receiver bridge at the bottom, should be 3.935" with a variance of no more than minus .010" from the front of the receiver. So anywhere within 3.925" to 3.935" should be fine and safe. If it is anything else outside these dimensions, send it back immediately.

As for headspace, tell them you want to know the chamber headspace before it is sent back. See if you can get a video with a bright light of the chamber reaming job. We need to know if there are rough lines in the bottleneck area. This also greatly contributes to gas robbing. A good pic will work too, one from bottom of receiver to see top side of bottleneck, and another from top side of receiver to see the bottom of the bottleneck. Will require a bent neck or flexible light and removing the bolt.

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