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Discussion Starter #1
I have a PTR91SC. I have a Bill Springfield trigger job. Zero creep and crisp break. My problem is, I get two-three bumpfire burst every three to four trigger pulls. My Range officer gives me the evil eye whenever it happens. I have a PRS2 stock with a Ghillebear buffer. I sent back the trigger to bill and he returned it. I still get the bumpfires. My question is.....am I the problem? I shoot from a bench with the stock firm into my shoulder. Any tips/ideas on how to correct the problem? should i try to break in the trigger more? TIA
 

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You are saying you get bursts with 1 pull of the trigger? That is not bumpfire. That is full auto. Bill should replace the pack or you should purchase a replacement.
 

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You are saying you get bursts with 1 pull of the trigger? That is not bumpfire. That is full auto. Bill should replace the pack or you should purchase a replacement.
+1 You have an unregistered machinegun. I would not shoot it until that is fixed. You're very lucky the range officer didn't contact Law Enforcement, or you'd be spending the cost of a registered sear on a legal defense in Federal court. The first trigger pull is a mistake. After that, it is on you.

Scott
 

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Sounds like its running away. Def fix that before you end up in some olofson situation like scott said. I would contact bill again, I would be surprised if he didn't help you out.

Just curious, what sear spring is in it?
 

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Is it the trigger is so light that the recoil is causing you to crank off more rounds or do you know your finger isn't activating the trigger and the weapon is doubling on it's own
 

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The Librarian
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Is it really a machine gun if it lacks an auto sear aka sear catch? That PTR doesn't have a trip lever or a F/A bolt so I would check all my bases including bolt gap and rollers, but something tells me the actual "sear" which is located rear to the hammer is worn and should be replaced or possibly dirty.

Another possibility is that your trigger housing is out of spec.

Also make sure your entire semi trigger pack is clean, dirt trapped in the trigger can cause your gun to go crazy. At least this has been my experience with 90's series trigger packs.
 

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That's what I'm thinking. That would be bump fire. I get it every once in a great while for numerous semi autos when I'm having a little too much finger action fun with the trigger.

OP could test this by making an effort to hold the trigger back on a single pull to see if it doubles or more.
 

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If Bill already took a second look at the pack I'd say it has to be your technique. Work on holding down the trigger after each shot. No one ever taught me to do that, it's just something I noticed people doing on youtube and it really does seem to work.
 

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Discussion Starter #10
Im going to send it back to bill one last time and ask him to clean the pack and take a look at the sear. Im hoping it will fix it. thx all
 

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Bumpfire means the trigger is pressed by the recoil acting on the shooters finger, causing it to bounce around and "bump" the trigger twice, hence the escape from the definition of multiple shots fired from a single trigger pull.

I had a trigger group from Bill that had an odd problem- the sear would get stuck and not rotate on it's pin. I took it apart and took the sear spring out as well and really cleaned it, it still hung up. This caused the hammer to "float" and would have produced a phenomenon known as "slamfire" where the hammer is totally unregulated.

Take your trigger pack out. Hold the hammer and depress the trigger, allow the hammer it move forward and touch the rest. Keep pressure on the trigger and push the hammer back into its cocked position. If the hammer catches the sear and is controlled, it's probably ok. If it just swings forward again then you have a stuck sear. Try and replicate the process many times and see if it hangs up intermittently.
 

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I'm surprised no one has mentioned this. You barrel is on a rest right? The stock is tight to your shoulder. It is possible the rifle recoils and rocks the rest back. You pull the rifle forward the rest rocks forward causing another trigger pull. You have a very light trigger. If this is the case you are indeed bump firing.
I would try to fire the weapon while standing and see if the doubles happen again. If the weapon still doubles or triples I would get it fixed asap.
 

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Unrepentant HKHolic
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I pull the trigger all the way back and it will send two rounds
That's the exact definition of a machine gun
+1 That is the exact legal definition of a machine gun there is no technique involved here with that Definition..........Put a little Flux on it that should clear it up :52:
 

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If Bill already took a second look at the pack I'd say it has to be your technique. Work on holding down the trigger after each shot. No one ever taught me to do that, it's just something I noticed people doing on youtube and it really does seem to work.
Not necessarily, as there have been reports of Bill's work producing these results.
 

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Not necessarily, as there have been reports of Bill's work producing these results.
Sounds like he's the man if one wants two round burst capability on their rifles!

Triggers come from the factory a certain way for a reason. Personally, I'm not one to mess with that unless there is a problem.
 

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My test has been to pull the group off, pull trigger holding the hammer and let it go forward. Record the trigger and let the trigger reset. Whack the back of the housing with a rubber mallet, maybe more than once. Did the hammer fall?
 

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I had that problem on 1 of 3 he did. Called him. He told me how to fix it over the phone. He'll make it right. I still trust him for future work.
 
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