CNC FCG problem

[JohnEd]

Firstly, this is some high quality parts package.  I have no way to verify it's dimensional accuracy but my gut tells me it is NASA quality.

I installed this FCG in a Receiver made by Ohio   I have had other problems with this receiver is a fact that should be noted.  My problem was that I couldn't get the sear to release the Striker.  The engagement was just way to much.  The CNC sear doesn't seem to move down as much or as far as the OEM parts.  That should account for the CNC having less creep or let-off or travel.  The CNC is smooth but that counts for little if it won't go bang.

My fix was to file away the latching surface on the Striker till it fired.  I removed a lot of material and I tested and blued all along the way partly driven by fear.  It now works very well....I think.  I have had many FTF and JAMS but I think that is due to the Receiver feed ramp irregularities.

I experienced the "gremlin" a few time out of 90 rounds.  I cut and welded the piece that modifies the Carrier for that problem.  It seems like such a straight forward fix I don't see how i could have gotten that wrong.  Any ideas?

I have looked at maybe 5 different Strikers.  They all "look" to be the same dimensions.  NONE OF THEM has a engagement signature from the Sear that is close to the same.  One is about 1/16 inch and that is by far the smallest and the rest go up to 3/16 inch.  All of these were paired with OEM FCGs.

Thanks,

John

[RSR]

I'm guessing you're talking about an AWO/ORF receiver and not an OOW one... 

Best guess is that the receiver is out spec, which unfortunately is par for the course w/ AWO/ORF...  They're to be considered builder-grade -- fitting/fiddling required to get them to work...  Unlike their Galil receivers, I haven't heard of any of the VZ58 ones needing to go in the garbage, so that's perhaps a step up...

[Joel63]

Also check the striker spring guide rod, mine was bent down slightly and caused the same condition. Once straightened no grinding of the striker was necessary.

[JohnEd]

Also check the striker spring guide rod, mine was bent down slightly and caused the same condition. Once straightened no grinding of the striker was necessary.

OUCH!  DOUBLE OUCH!

I can't check that cause the gun is shipped.  I can see what you are saying.  Brought to mind that about a month ago and before painting I tried the carrier and striker.  Found that the striker was loose in the carrier and hung down quite a bit when in the extended, cocked, position.  I peened the carrier slightly to tighten the striker.  I'll bet I caused this condition even though I never had it together with a FCG at that point.  I know the Striker is in there proper tight and has far less wobble.  none of this gun's parts fit snug.  I have fired it enough to know it is safe but I will warn the new owner.  Fortunately it was a gift....?  What-a-guy.

[JohnEd]

I'm guessing you're talking about an AWO/ORF receiver and not an OOW one... 

Best guess is that the receiver is out spec, which unfortunately is par for the course w/ AWO/ORF...  They're to be considered builder-grade -- fitting/fiddling required to get them to work...  Unlike their Galil receivers, I haven't heard of any of the VZ58 ones needing to go in the garbage, so that's perhaps a step up...

It is an Ohio Rapid Fire.  I did find that the Striker wasd hanging down an awful lot when I was looking at the gun a couple months ago.  The parts had deep wear signatures.  I peened a little here and there and put in a couple punch marks to take up some of the slack.  I did get it tightened up but "maybe" I somehow positioned it "low".  Doesn't seem reasonable but the carriere does work out to being closer to the Sear than on any other gun I have put together.

I think I heard you say CNC Warrior did a good job.  I'll try them next time.

Thanks,

John