Blue vs clear bumper

[flyingpootang]

Anyone use the blue bumpers vs the clear ones on a L10 with a X/E/RT type valves and a L10 bolt without any long term affect? I'm just tired of the clear ones getting eaten away even though they're glued to the valve. I measured the thickness of both and they are the exact same thickness....

[MournBlade]

The blue bumpers can bounce the level 10 bolt out of the sear catch and can damage the bolt.

[Mechanic79]

The clear ones are more pliable.
The blue ones are less pliable.

I've used both and prefer the blue ones because they hold up better/last longer. I use them on all my AGD guns. Emag, RT ULE, previous DevilMag,

[ljpiller]

Mine has a black rubber-like bumper in it, how does that stack up?

[Hilltop Customs]

The clear ones are more pliable.
The blue ones are less pliable.

I've used both and prefer the blue ones because they hold up better/last longer. I use them on all my AGD guns. Emag, RT ULE, previous DevilMag,

+1

originally had a clear one on my x valve that held up for a case before it was ate up. Got 2 more clears, tried the glue trick with no benifits. Switched to a blue and havent changed it in 4 years or so.


Ive never heard of a black one? Did you get it second hand or something? maybe someone replaced the bumper with a rubber washer?

[WickedKlown2]

Not to long ago a bought a E-Mag valve w/lvl 7 and it came with a black bumper on it... I have since replaced it with a blue bumper and a lvl 10 kit... No worries here so far...

[DevilMan]

From AGD site..

"The clear urethane washer sits at the base of your power tube. When the bolt returns, it hits this to decelerate. This bumper is a little softer than the standard blue bumper for the higher firing rate of the Retro Valve. The bumper should be replaced about once a year."



Hope it helps...

And nooooo no mention of the black one yet...

DM

[Ruler_Mark]

my friend bought an emag and the clear oring was cooked onto the gun and turned black, that could be what you have, it was stuck to the bolt and valve. Spend a few more $$ a year and stay 'CLEAR' of any problems.

[athomas]

I wouldn't worry about using a blue bumper, especially with the level 10 bolt. The level 10 bolt doesn't return quite as fast as the level 7, therefore the impact force on the front of the valve is less than the level 7 bolt. The clear bumper is softer and absorbs impact when in new condition. The blue bumper is harder but will spread the impact force out over a wider area. The shreading of the clear bumper plus the smaller area at the base of the level 10 allows more impact force per square inch to be applied to the front of the valve when using the clear bumper anyway. I think the benefits of the longevity of the blue bumper merit some thought.

[Ruler_Mark]

I wouldn't worry about using a blue bumper, especially with the level 10 bolt. The level 10 bolt doesn't return quite as fast as the level 7, therefore the impact force on the front of the valve is less than the level 7 bolt. The clear bumper is softer and absorbs impact when in new condition. The blue bumper is harder but will spread the impact force out over a wider area. The shreading of the clear bumper plus the smaller area at the base of the level 10 allows more impact force per square inch to be applied to the front of the valve when using the clear bumper anyway. I think the benefits of the longevity of the blue bumper merit some thought.

I beg to differ. the forward force is less on the lvl X because of the spring, in the same respect the spring pushes harder on a lvl X bolt to return it vs the lvl 7 because of the spring. with all the air down the barrel the only horizontal force on the bolt is the spring. the lvl X springs have a higher spring constants vs the lvl 7 spring therefore yielding a higher force.

[athomas]

I beg to differ. the forward force is less on the lvl X because of the spring, in the same respect the spring pushes harder on a lvl X bolt to return it vs the lvl 7 because of the spring. with all the air down the barrel the only horizontal force on the bolt is the spring. the lvl X springs have a higher spring constants vs the lvl 7 spring therefore yielding a higher force.

Because of the reduced differential pressure, the exhaust air tapers off more gently than with a level 7 bolt. There is more retained pressure in the chamber. This results in less acceleration towards the reset position, even with a stiffer spring.

[ajnin]

i have a black bumper on one of my mags. it even cameon the mag with the reg capped. odd gun.

[Ruler_Mark]

Because of the reduced differential pressure, the exhaust air tapers off more gently than with a level 7 bolt. There is more retained pressure in the chamber. This results in less acceleration towards the reset position, even with a stiffer spring.

Is this a vacuum pressure?

[snoopay700]

If i recall correctly, isn't the black bumper for a pump mag, and it was smaller in diameter and everything?

[AGDRetro]

If i recall correctly, isn't the black bumper for a pump mag, and it was smaller in diameter and everything?

Yes, typically the black ones are found on Pump Mags and have a smaller diameter (so the wave spring fits around it).

Tunaman has suggested Loctite 380 aka Black Maxx to adhere the clear bumpers to the valve, but I have had little success with that stuff. I ordered some Loctite 4851, which is a clear but flexible instant adhesive, through work at Fastenal (part number #0682683). I'm hoping that the 4851's flexibility will finally give us solid solution for the RT bumper!

I have to purchase a minimum of 10 to meet the minimum order requirements for this item, even with my Fastenal employee discount I'm still paying $15.51 per bottle! If this stuff is the miracle glue we've been searching for I will gladly get the other 9 bottles to any intrested AOer's! I'll let you know my results when I test the stuff!

If 4851 doesn't work, I'm just gonna chew up my clear bumpers and use the blue ones till my X-Valves explode!