Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Will this sight fit a standard Mossberg breacher barrel?
Document: Big T, overcharged me for these sights 112.00 dollars these sights are selling for 75.00 as we speak!! The front sight had a manufacturer defect the sight tip which is red had to be seriously adjusted in order to fit the holding plate which has to be soldered to the barrel. That means reparkerizing  your barrel because the finish on your barrel will be damaged from the soldering. This did not cost me 25.00 dollars more like 95.00dollars.
If you have a Mossberg 500, it is worth the investment. Clear ghost ring sight and fast acquisition. Need to have a gunsmith attach the front sight because it needs to be welded to the barrel.
The sight is of good quality. It has both elevation and windage built into the rear sight(ring). The instructions for the installation could be allot clearer. The major drawback with this sight system is the attachment of the front sight. Mossberg recommends that the front sight be attached by brazing. This process will discolor both the sight and the blued or Parkerised barrel and this will require that the barrel assembly be reblued. There are a number of gunsmiths who will not do the job.
Was unaware that this product would not fit my Mossberg 500 tactical. Told by my local gunsmith it would not fit. Double check before purchasing. Had to return and pay restocking fee and return shipping.
Bought to upgrade my bead sight on my 590. Need to find a gunsmith to install front sight as it needs to be soldered and probably have to have barrel reblued/parkerized.
Very good craftsmanship, sight works wonders. Had to silver braze it, and drill and tap the receiver myself. BEWARE! it uses an 8-40 tap which I didnt have so I had to buy one because I couldnt install it without it. If you plan to make the gunsmithing yourself, get a 8-40 tap and a 28 drill!. If you are not sure, dont use JB weld. Have it taken to a competent gunsmith. That beats damaging your barrel any day.
I put these on my Mossberg 500A. The rear sight was simple and I installed that one myself. The front sight I had to have sent out to a gunsmith. Let me tell you here in NY that was no easy feat. I called 15-20 gun shops and nobody would touch it. I found one that did and he still has the gun going on 2 months now. It's his busy season and I was warned it will take a while so no big deal.
they were excatly what was advertised and very strong and robust construction  would purchase these for any mossberg i own
Perfect addition to my Mossberg 590. Needs to be installed by a gunsmith. Durable and looks good. Buy it for your tactical shotgun.
Awesome customer service. Item shipped quickly from supplier with tracking info available. Nothing works better for Mossberg shotguns than Mossberg factory equipment!
Answer: yes