QB79 .177 bolt is tight

[daguasta]

When i put the bolt forward and lock it in its tight... try to load a pellet in its even more so....any suggestions gents?

[SeanMP]

The QB bolts are usually very sticky when new.

I take mine out and buff them a bit with some emery and crocus and then put a buff coat of moly or PTFE grease on them.

Instantly better.

Or rub a little lube on the areas you can see and keep working it.

[daguasta]

The QB bolts are usually very sticky when new.

I take mine out and buff them a bit with some emery and crocus and then put a buff coat of moly or PTFE grease on them.

Instantly better.

Or rub a little lube on the areas you can see and keep working it.

its against my better judgement to take apart a new gun but so be it....lol...should i just emery the probe?

[Dukemeister]

I waited a few weeks before tearing mine apart, but why wait - they benefit greatly from a polish, lube and re-seal.
To do what Sean has suggested, you will need to open up the breach, but if you're careful you can reuse the factory breach seal so don't worry if you don't have a seal kit.
Polish up the bolt, hammer, hammer spring, cocking pins. If you ever think you will install a hammer de bouncer from Archer (over priced little U shaped piece of metal supposed to increase your shot count by 30-50%) then don't polish the pin slots.

[AirGunEric]

That would be the biggest issue with all the QB's- rarely does one not need to take it apart soon after getting it. If someone isn't mechanically inclined, or wants "perfect" out of the box- QB's are not for them. It's sad really, with just a bit more effort at the factory, they would have a super-accurate and, if better seals were used, long-lasting product at minimal, if any, extra cost. But, as many people have put it before, they are a bit of a "diamond in the rough' and can be some of the best shooters around, with a bit of effort.

[daguasta]

That would be the biggest issue with all the QB's- rarely does one not need to take it apart soon after getting it. If someone isn't mechanically inclined, or wants "perfect" out of the box- QB's are not for them. It's sad really, with just a bit more effort at the factory, they would have a super-accurate and, if better seals were used, long-lasting product at minimal, if any, extra cost. But, as many people have put it before, they are a bit of a "diamond in the rough' and can be some of the best shooters around, with a bit of effort.

guess i was spoiled then with my 78d...it was great out of the box....eh...gotta do what i gotta do! ;)

[SeanMP]

On a good note though I've noticed recently that the hammers and cocking blocks are really smooth and shiny. They look like they have been put through a tumble mill. So maybe they are getting it ....slowly.

[blade57]

Sometimes it's great to just tinker and polish stuff. I really enjoyed deburring and cleaning up the internals on an AR2079A I just got.

Cheers

DaveD

[bitterman]

Qb's are pretty nice but for sure need a little TLC.

I got a qb78d for my son ... was going to be xmas present but.. Its more dads toy now :)

It's been apart a few times :) Tuned

2 things I should note....

1) Check your crown... I know mine was bad. Used the brass screw trick and now its a tack driver.

2) The barrel band need to be attached to the co2 tube some how otherwise it moves and cause left to right shift in poi... a set screw does the trick.

At the same time both my brother-in-laws got qb's for xmas ;)

Bruce

[blade57]

1) Check your crown... I know mine was bad. Used the brass screw trick and now its a tack driver


Bruce

Hi Bruce,

Could you explain "the brass screw trick" to me please

DaveD