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What is barrel droop and

March 30 2011 at 7:38 AM
Mike  (Login MadMike740)

does every gun have it? Explanation? I'm looking to put a scope on and I keep hearing all this Barrel Droop talk...MY barrel doesn't look droopy, when I shoulder my M34 the sights line up perfectly and it feels perfect.

When I should a side by side shotgun and look down it, to me the barrels look like they're bowed like a banana...is that what barrel droop is?

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Dan L.
(Login DeadEyeDan)

Built in

March 30 2011, 10:18 AM 

RWS designs barrel droop into their rifles thus controlling the inevitable. Barrel droop is just that it starts at where the barrel hinges and does not effect accuracy but usually requires a special mounting system for scopes. Ive heard you can fix droop usually through an experiencing gunsmith, but why bother?

I have a CZ that has massive droop and is deadly accurate.

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(Login lettercarrier)

droop anyone??

March 30 2011, 2:56 PM 

I have been and will be one of the biggest proponents agains this nonsense, EXCUSE me for what follows

only Diana has this issue incorporated into their lines and there is NO rhyme or reason since the droop can be all the way from 4 to 17 degrees, not a uniform or consistent droop from the factory

I have many Diana's and none have the barrel droop because they are dealt with extreme prejudice and corrected with the help of a 2 X 4 from Home Depot

don't need a "SPECIAL" droop compensator mount to correct the barrel droop

but if you can live with it then so be it


and remember "it's 30% the gun and 70% the shooter"

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(Login Hunter_NZ)

Re: droop anyone??

March 30 2011, 9:18 PM 

I agree with you Warren,

my 54 has droop, a sidelever compensation mount adjusts for 17.1 inches yet my droop isnt 17.1, there seems to be no uniformity to this droop and it's a real pain in the butt. After buying the Diana, you need to buy a compensator mount, and then buy a scope and rings.

If you use a large objective scope like I do such as a 56mm then your scope is so damn high and unless you have a longgg face your not going to get a cheek weld on the cheek piece.

My diana 31 has no droop and is a dream.

I love my Diana's for they are but I wont be buying another one.

I've been through so many different types of ring's and mounts trying to combat this droop drama that next I'm taking it into a gunsmith and letting him beat the barrel into a straight line.

No other air gun manufacture incorporates droop, and if they did I'd bet it would be one setting, not as Warren says somewhere between 4 and 17 inches, and I think it's a far greater spread than that as the UTG compensation mount for Diana break barrels is set to 20 inches.

I'd love to hear from a Diana representative why it ranges from 4-20 inches, my guess is, they wouldn't have an answer.

ZVP, I know you put up a thread saying Brands, tuners etc were winging about what people were saying on this forum about their products or services etc, I guess they don't like the truth being expressed, but we do have freedom of speach.

If they don't like it, tell them to address the issue, if they have a problem with my statement, they're welcome to email me or fly over to my house, I'll show them my Diana's and my friend's and we will all Wait for an explanation.

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(no login)

I've got a 34 that has the opposite,

April 1 2011, 12:14 PM 

(It's drooped up) and has been since new,(And no, it's not been shot while open) either,lol.

It was that way right from the factory except it has a Germise Barrel and perhaps the Chinese planned it that way,lol.

My 350 has a slight droop,but not noticeable to the eye,so it's hardly there at all.She has a German barrel too and I like that but it's choked tighter than the 12 groove.

C'Mon Diana,,take the Droop Factor out like HW has.

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(Login tallguy606)


March 30 2011, 5:48 PM 

Droop is when the barrel does not extend out parallel to the receiver tube. Turn your gun on its side, sight down the side of the compression tube, and you can see that the barrel points downward relative to the compression tube. My 34 has droop but shoots great; my newer 350 Feuerkraft .22 has almost no droop; that is, the barrel is almost parallel its full length to the receiver tube.

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(no login)

Best to do a search here

March 30 2011, 5:51 PM 

It's all been said, a couple dozen times, but well said. Diana incorporates droop, from what has been reported by Diana, to adjust the iron sights so that they shoot within the range of their adjustments. This because so much of their market, apparently, uses iron sights. But search and have some snacks and a couple of drinks handy. There's lot to learn.

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IH Johnstone
(Login IHJohnstone)

A few things, Mike

April 1 2011, 1:52 AM 

Not all Diana guns have droop, my M52 doesn't exhibit any.

Droop (where present) is deliberately induced at the factory by hand (which explains the 'range of severity'). Its put there so the gun can be used with open sights & at relatively short range.

Most 10 Metre Target spring guns had droop built-in, I recently saw a 'used' HW 55 Target (I think that was the model) with a massive amount of barrel droop.

On the plus side happy.gif

A skilled gunsmith could do straighten any barrel in about 10 minutes...

[IMG][linked image][/IMG]

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Ron Whitehead
(no login)

I doubt droop is built ,

April 1 2011, 1:50 PM 

I would think BBL droop has to do with the manufacturing process rqther than Diana incorperating it into each gun. That would add a process building the BBL assembly and be costly.
I used the 2x4 process for fixing my 34 droop a couple years ago and never looked back , Gun is accurate ,zero,s with any scope I have tried, what more could you ask for.

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IH Johnstone
(Login IHJohnstone)

Explain yourself, Ron

April 1 2011, 2:36 PM 


1) & its not just you but why is a Barrel described as a 'BBL' in the US (cant make head nor tail of that).

2) How is the 'droop' part of any manufacturing process (I think your implying 'slack' workmanship) but in fact it IS a final stage of the gun making process at M & G (sometimes) and makes use of the time / labour of very highly skilled gunsmiths. To do this they use a rather more complex version of the kit shown in my photo.

The Merits / Demerits of barrel droop are not under discussion right here, I personally cant see many virtues in an enforced barrel droop, its a complete PITA I would imagine.

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(no login)

Re: Explain yourself, Ron

April 1 2011, 3:18 PM 

Sorry if I offended you by discribing a barrel as a BBL, I do enjoy air rifles but not anal about them.
I had barrel droop in my 34 and built a homemade jig and fixed the problem. {it worked and I moved on} I have worked in manfacturing for many years [now retired} and can assure you Diana is just another company trying to make a profit and does not spend a lot of process time trying to adjust a barrel on your air rifle.
Again sorry if I offended anyone this just my humble opinion.

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IH Johnstone
(Login IHJohnstone)

Nil offence, Ron

April 1 2011, 4:20 PM 

RE: 1) I'll find someone else to blame ! happy.gif.

about 2) Yes, it does seem totally 'odd' to spend time putting in a procedure / step in the whole process with this particular end result. Whilst there are a lot of 'shooters' in Germany using the open sights and at low power levels surely a CBA would show that's its more effective / profitable to make without any droop for your total World wide sales?

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Jeff C.
(Login Dieker)

IH I always thought BBL meant Break Barrel. I agree if

December 30 2012, 10:54 AM 

a guy is using alot of abbreviations they should be spelled out the first time and then used freely. Theres alot of that in classified adds and it real annoying. You don't want to assume anything when buying a gun.

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(no login)


January 4 2012, 2:38 AM 

ive a weihrauch and the drop between the tip of the barrel at the muzzle and the line of sight taken along the scope rail is about .75 inches...thats 33 inches of drop at 45 yds....too much to compensate for with scope shimming or an adjustable mount. i believe it to be a catastrophic manufacturing defect if you intend fitting a scope

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Héctor J Medina G
(Login HectorMedina)

Ah . . . to be or not to be, that is the question

January 4 2012, 3:56 PM 

Friends!; Romans!, Country men!, Lend me your ears!

Ooops, wrong play.

It's just that this gets REAL old.

IH.- Bbl is the abbreviation of barrel (as in oil measure), so it is valid for gun barrels. Maybe not the purest of terms, but perfectly understandable. On your second entry, a MAJORITY of airguns are only and always used with iron sights. Trend is slowly favoring scopes, but still has about a decade to go till the scope users even come even to the iron sights users.

Ron.- Your thoughts are wrong. EVERY rifle is tested at M&G's test range before being packed. It is at that point where the sights are put in the mid position and the barrels corrected to hit POA at 10 meters. Because the sights are not perfectly identical, droops are not identical.

Darren.- Droop is a problem ONLY if you use a scope. If you use the factory iron sights, then it is precisely what allows you to hit what you're aiming at in the short distance most airguns are used. If the barrels were not drooped, the stocks and LOS's would be totally weird and crazy looking.

MOST well made airguns have droop (it means they were tested and aimed at the factory). If this is a bother to you because you use a scope, correct it or have someone qualified correct it for you. It is a simple bending procedure. It just needs good control of force and experience in straightening things out.

Now, get out and shoot!


Un Abrazo!


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John Flahr, Sr.
(Login jafjaf)


January 4 2012, 4:18 PM 

I own two HW and there is no noticeable droop,as I can take the scope off of the HW77 and put it on my HW50s and with not more than a few clicks it is shooting right on,My diana20T01 had a lot of barrel droop when I recieved it and after asking around a bit I found I could straighten the barrel or at least bend it up. The accuracy on this little gun was amasing considering it was not a real expencive air rifle. especialy after I got a spring and seal from Hector via Diana Thanks again Hector John

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(no login)

Barrel Droop

January 4 2012, 5:15 PM 


On my RWS 54 I installed a Leapers 4-16x56 with a one piece mount that did not compensate for droop. I ran out of scope adjustment and was still shooting 8" low at 22 yards. I then purchased the Leapers Scope base with 17" of droop compensation and all is good. I also used Weaver 4 screw rings to keep the scope tube from sliding through the rings. This combo has worked well for 2000 rounds so far. I also have a 30mm tube that seems to grip better with the added surface area.


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(Login aom22)

Re: Ah . . . to be or not to be, that is the question

December 30 2012, 7:05 PM 

Héctor has written extensively on this topic over and over and again.
Here are a few links that will explain about barrel droop.
I know ... study these links ... you'll learn a lot.


This message has been edited by aom22 on Jun 23, 2013 1:10 PM

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(Login RedFeather)
Owner Moderator

Ian, I have a m/f dbl bbl dt'd 12 ga o/u

January 4 2012, 6:25 PM 

Whew! Was THAT ever hard to type right!

Go with the adjusting the irons sights explanation. It makes sense, considering that Diana's market covers many areas where the guns are used for close range pest control and the iron sights are all that they will ever wear. All of this droop poop stems from scoping the guns and, since scopes and rings come in various sizes and heights, it can get complicated rather quickly. You can either shim, bend the barrel or try one of the new adjustable scope bases. But, if you bend the barrel, you might not be able to use those sights again.

(Modified/Full Choke, double barreled, double triggered twelve gauge over/under)

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(Login Lizzylou)

Re: What is barrel droop and

January 12 2012, 2:59 PM 

I have three 34's. Two of them have barrel droop. The third one doesn't because it had a bent barrel (most likely a barrel-slap problem) when I bought it, and I straightened the barrel myself.

That being said, the droop in the other two doesn't bother me. I use the UTG compensator mounts and I love that mounting system, lol.

Lemonade out of lemons. happy.gif

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