Help Needed with FTF issue

[mobilebyrd]

I am troubleshooting a BTA 90 with FTF issues. The bullets get wedged below the slide between the right side (ejection port side) of the feed ramp and the receiver. A hard tap on the mag will send the slide home, but, it passes over the bullet rather than chambering it. Here is a link to a YouTube video https://youtu.be/fhQpguolH-A showing the end result of the FTF issue. Currently, I have to drop the mag, rack the slide a couple of times, reinsert the mag and rack the slide again to get back into business.

The FTF issues, along with some FTE issues, happen with FMJs and hollow points from multiple brands (WWB, GA Arms, Hornady, Tula, etc).

I did a little work on the pistol (outlined below) which solved most FTE issues and significantly reduced the FTF issues, but, I have no need for a pistol I can't stake my life on...and I can't do that with this pistol (yet). I really like the pistol and would prefer to fix it rather than sell it for parts. It points well and is accurate when functioning.

I took the following steps at addressing the issue(s) in the following order:

• cleaned the Heck out of the pistol
• bought a "new" mag at a gun show (looks like a rebuild w/ an orange anti-tilt follower)
• installed an extra power extractor spring, polishing the feed ramp, extractor and re-cleaned everything (most FTE issues solved at this stage)
• Lightly polished chamber (mostly to remove anything the cleaners/brushes missed)
• straightened the ejector as it was slightly crooked
• stretched the mag spring for a little more pressure and ensured it was straight before reinstalling
• polished and cleaned the guide rod (grasping at straws by this point)

I hand cycled 112 new rounds last night and had 2 FTE (probably from short-stroking) and 2 FTF. As previously stated: the FTF wedges the bullet between the receiver and feed ramp in a manner which allows the slide to be sent home without chambering the round.

At this point, I decided it was time to seek assistance from more knowledgeable persons.


Any references to polishing involves a fine polishing paste and a cotton buffing wheel/pad rotating between 1000 and 2,500 RPM depending upon material being polished.

[tdogg]

It may be the slide stop hitting the top round in the mag.  Try this:  With the slide locked back, take a mag with at least one round in it and slowly insert it into the frame.  Watch the nose of the bullet as it passes the slide stop lock back nub (through the ejection port).  If it is hitting the slide stop you can grind it as seen in this thread:

http://www.czfirearms.us/index.php?topic=38489.0

After watching you video your slide stop is not modified.

I don't know if that is your problem but it is something to try.

Cheers,
Toby

[mobilebyrd]

Thanks for the advice Toby.

I'll pull her out of the safe this weekend and see if this is an issue.

I'll check the catch before I finish polishing out some rather deep milling marks on the feed ramp.

[1SOW]

Just to illustrate:

[mobilebyrd]

I could be wrong, but, I don't think it's the slide stop. Here is a short 10 second video showing the may bring feed into the Pisrtol. http://www.youtube.com/watch?v=G94ga4WgJdQ&sns=tw via @you tub's

I think it's the mags. Some of the bullets are nose diving when being chambered.

[coolbox]

Seems to me a mag related issue. Try a different magazine, or a proper new one, or at least new mag spring and follower. I have a feeling there is not enough strength in the mag springs in your case.

[pdxrealtor]

Check the breach face for any burrs, and even if none five it a quick scrub with some 600-800-1000 grit.

There's a little part that accepts the notch of the bullet case as it rises up into the chamber, it will be on the right hand side if looking up and down into the gun, gun facing forward. Also identifiable as opposite of the ejector rod, which is on the left. Make sure this is clean and free of burrs. Perhaps take an empty shell and verify it slides in and out without hangup.

This was the cause of my nose dives on my Rami. Once I did the above I've not had one issue.