Bolt pin mod

[KMA]

Well... it's not much of a mod really. I replaced the white disk on the bolt pin with a urethane oring. Why you ask? Well, I have a theory I'm testing out...

Some background: I've always had a FSDO issue if the gun sits for several minutes. The first shot or two do not even get out of the barrel. I tried absolutely, positively everything since I got my quest over a year ago, including calling FEP and speaking with them. It gets worse as I lower the LPR, but raising does not fix it completely. Dwell, anti-FSDO, lube, orings, etc...

Anyway, back to the mod... my theory is that the flat surface of the white disk was causing stiction between the bolt and pin when covered with lube. I'm hoping that the less surface area exposed by the oring (since its round) will reduce or completely eliminate the stiction (and any FSDO). If it seems to help, then I will likely modify the white disk instead of keeping the oring.

I think some others have struggled with the same issue I've seen, so I'll let you know my findings over time. I love my quest other than this FSDO problem, so it would be nice to address this one issue. If it doesn't work, I have one final idea that I will try...

[ArchAngel666]

Wow, that seems like a really good idea to me. What size o-ring does it take?

If it works I would definitely do this.

[NYGuardians capt.]

sounds like a good idea!

[Chicago Quest]

good luck
i realy dont see it working w/o the o ring rooling off the bolt guide
but show me wrong:tup:

[::SYNTAX:::]

dont use an oring, eventually it will sheer and ruin your whole day.


just try not to get any lube on the bumper. or up your dwell.

[BloodyDeadDeer>Vomit]

oh ask FEP for a new rear disk, and do some modifications to it. all you would have to do is a few dremeled lines to break the supposid suction. honestly I dont think that is the problem tho.

[KMA]

good luck
i realy dont see it working w/o the o ring rooling off the bolt guide
but show me wrong:tup:
It can't roll off as long as the bolt is on it... and it's inserted in the gun.

dont use an oring, eventually it will sheer and ruin your whole day.

just try not to get any lube on the bumper. or up your dwell.
I'm not sure why the oring would shear or break, since it is just sitting between the bolt and pin. Plus, I hoping the oring is just temporary for testing purposes.

Regarding the lube/dwell comment... already tried it as I've alluded to in my original post. Lube always find it's way to the disk eventually.

oh ask FEP for a new rear disk, and do some modifications to it. all you would have to do is a few dremeled lines to break the supposid suction. honestly I dont think that is the problem tho.
Yeah, dremeling lines in the disk is almost exactly what I had mind, with a slight twist. Whether the "stiction" contributes to my problem or not, well I'm hoping my oring test will shed some light.

[olegodo]

I have done it and used it for a long time. And it works! I actually made a post about it here a long time ago.
but, the o-ring will break sooner or later. As the good FEP people commented in my thread.
I used buna (regular black ones) o-ring, it held up fine, but a urethane will probably last longer.
it also softens the "kick" since the o-ring is softer then the white spacer.
Btw, being careful not to get lube on the white spacer does the same trick ;)
once you get lube on it, it will start to stick.

[ShockerGEEk]

I did basically the same mod to my old DC Viking...but it wasnt for FSDO. I shot it probably 20,000 shots after I put the oring in....no problems with it. Never tore, ripped, sheared, mangled....nothing. So Im just guessing you shouldnt have any problems with your mod.

[trevor_clay_10]

can i have pic about what you guys are talking about?

im not fully understanding what you did

[KMA]

can i have pic about what you guys are talking about?

im not fully understanding what you did
I'm at work, so I can't get you a pic... but it's pretty simple to explain.

[Note: I'm using bolt "guide" in my decription, while many refer to it as the bolt "pin".]

Take out your bolt/guide assembly (black bolt guide is unscrewed from the back of the gun, and the bolt itself is either silver or gold). You should see a white plastic disk sitting towards the back of the bolt guide. The back end of the bolt bumps/rests against this disk when inserted all the way onto the guide.

I replaced this white disk with a urethane oring for the reasons I've stated earlier.

[KMA]

I have done it and used it for a long time. And it works! I actually made a post about it here a long time ago.
but, the o-ring will break sooner or later. As the good FEP people commented in my thread.
I used buna (regular black ones) o-ring, it held up fine, but a urethane will probably last longer.
it also softens the "kick" since the o-ring is softer then the white spacer.
Btw, being careful not to get lube on the white spacer does the same trick ;)
once you get lube on it, it will start to stick.
Right, I used the urethane feeling it would hold up better, plus it was less "squishy". :blush: It's only temporary, but if for some reason it became a permanent change, I could just replace it periodically to ensure it does not break.

I tried to keep lube off of the spacer, believe me! It finds its way onto to it eventually, at least in my gun. :xeyed:

Thanks for the input everyone! :tup:

[ghettofbls925]

dont use an oring, eventually it will sheer and ruin your whole day.

Yeah eventually, but the first and middle part are AMAZING!!!! (You'll understand if you listen to Mitch Hedberg)

[fAllout_oMen]

Just buy a bunch of o-rings and change it every few cases. should be good. O-rings are cheap anyways

[BloodyDeadDeer>Vomit]

Yeah eventually, but the first and middle part are AMAZING!!!! (You'll understand if you listen to Mitch Hedberg)

RIP funny man....He was a great guy, he just "liked the first and middle part" way to much....hence why it was way to short.

[BigBadGooz]

Pics

[pber13]

stiction is a sweet word

[bangbang]

what size oring are u using?

[olegodo]

Just use one that is the same size as the white washer thinngy ;) what i did.
il get a pic up in a sec.

[olegodo]

Here are pics.
the o-ring goes where the white spacer normaly sits. between the bolt and boltpin.

http://i171.photobucket.com/albums/u305/olegodo/Bilde397.jpg
http://i171.photobucket.com/albums/u305/olegodo/Bilde396.jpg
http://i171.photobucket.com/albums/u305/olegodo/Bilde395-1.jpg

[BloodyDeadDeer>Vomit]

bah I need to break down and buy a snatch pin...unless somone is getting rid of one lol :)

[Gailon]

bah I need to break down and buy a snatch pin...unless somone is getting rid of one lol :)

Why? I never did. No reason to take out the bolt on the field. No reason to take it out where you wouldn't have tools available. And it just makes the gun longer. AFAIK the "internals" of the pin are the same as the stock right?

[KMA]

Thanks for the pics olegodo! :tup:

I believed I used the same size as the center bolt oring. I felt more comfortable using urethane vs buna... it seems like it would "hold up" better, and act more like the stock disk than buna.

[ArchAngel666]

Just replaced mine with one of the black orings because I have a set of them laying around :tup:

According to the set I have the closest thing I found was a 5/8" x 13/16" which is a 15.9x20.6mm.

Could be a little off but it's the closest I had.

[BloodyDeadDeer>Vomit]

Why? I never did. No reason to take out the bolt on the field. No reason to take it out where you wouldn't have tools available. And it just makes the gun longer. AFAIK the "internals" of the pin are the same as the stock right?

Too lazy to look for the wench most times. maybe I should just JB weld something on the back of the stock one...hmmm I have an Idea without welding putty.....wicked.. Maybe If I follow through with this one I will have a cheap upgrade to sell...

Bronc, Gailon, Josh, Grem, I might need your help...pm me please

[ghettofbls925]

So did this mod ever help out with fsdo?

[olegodo]

It does help.. im using it and it works sweet. And i have been using it for a long time. hasnt gone wrong yet.

[Drew-Ill]

Does this o-ring actually work or no?

i don't have air so i cant test but. i used a PM/DM Bumper o-ring.
small lil fat ones. when you stretch it on, it is exact width/size of the White spacer. i think it should be goood. i dunno lmk guys!

-drew

[exrated34]

i wonder if how much kick does it reduce

[Drew-Ill]

if i only had air :?

[LU_aDaK]

i wonder if how much kick does it reduce

look at my video....what kick is there to reducE?

[olegodo]

All tho there is almost no kick on a quest, the oring does make it feel even smoother.
it decreses the chance of fsdo, it makes you able to decrese the lpr even more (if you want to), witch makes the quest even quieter.
This is from my personal experience. i have used the same o-ring for 10months now, and it still holds up without a scratch.

[evileric77]

Here's what I've done to my bumper:

http://img213.imageshack.us/img213/6448/bumperonpinql5.jpg
http://img88.imageshack.us/img88/4541/frontofbumperoq7.jpg

[KMA]

Here's what I've done to my bumper:

http://img213.imageshack.us/img213/6448/bumperonpinql5.jpg
http://img88.imageshack.us/img88/4541/frontofbumperoq7.jpg
I like how you did yours... my bumper is similar, but I think yours would be easier to do for most people and just as effective. :tup:

[Intense One]

Trying small round dremel marks all around both sides of the white spacer.
About 10 marks per side.
Will let you know if this cuts FSDO.

Steve

[evileric77]

I only did one side, as the other doesn't really need it.

[KMA]

I only did one side, as the other doesn't really need it.
Right, I don't think you need to do both sides. You'll want the dremeled side facing the bolt.

Since making this change, I have yet to experience FSDO. :D To be fair, I've made other changes including a new HPR and ASA, but I don't think they are a factor. I also changed the bolt pin orings to fix a new leak, but I had done that a few times prior to this mod and it did not help the FSDO.

Anyway, I think the changes to the white spacer are worthwhile for people having FSDO that can't be cured any other way. :tup:

[rinso]

I've never had a huge issue with bolt stick, but I switched my bumper for a urethane tank o-ring and it works fantastic. I can run my lpr pretty low (50ish) without any negative effects. I'm beginning to think everyone should just change their bumper to an o-ring.

[KMA]

I've actually switched back to the urethane bolt oring instead of the modified white disk... I'm not exactly sure why, but I like the oring better. Either way, FSDO is completely gone on my marker since doing this. :tup: