I get this to store my Bostitch f21pl frame nailer  bostitch f21pl Round Head 1-1\/2 - Inch to 3-1\/2 - Inch Framing Nailer with positive Placement Tip and Magnesium Housing  it be a tight fit , but the zipper close and the frame nailer will be a lot happier in the bag , dust free , and hopefully free of the dent and ding it would receive it it be rattle around the back of my truck unprotected . I like the gunner bag and can recommend it . here be some point base on my use and observation : pro : \* size - this bag should fit just about any pneumatic nailer you have . the Bostitch I get it for be about as big as the other guy that shoot round head frame nail : Hitachi , Senco , Porter Cable , etc. . Mine fit best upside down , with the business end point toward the peak of the bag , on top . naturally , it will fit many smaller nailer , too , like a roofing nailer or a couple of finish nailer . \* well make - the material of the bag be rugged ripstop nylon and it seem to be put together well enough . stitch be mostly single and while the zipper be not particularly heavy duty -lrb- it be a nylon type - not metal -rrb- , it should last long enough . the handle be make of nylon webbing and will probably outlast other component of the bag . \* it be padded - I like this feature , for in addition to keep the dust off the tool , I also want the bag to afford it protection from bang and bump when it be ride along with my other tool in the back of the pickup . the side be not heavily padded , but it be enough to make a difference . while the bottom be not pad it do have a strip of rigid plastic run the length of the bag which should offer some protection as well . \* Versatile - The bag come with one pocket on the outside -lrb- which be where a bottle of my pneumatic tool oil life -rrb- and a couple of small pocket inside . give that it be already a tight fit inside for a full-size framing nailer and the fact that the interior pocket be fairly small , I do not see much practical purpose to these ; I would prefer to have another , larger , pocket on the exterior -lrb- perhaps with a closeable flap ? -rrb- where I could store the tip cover , sequential-fire trigger , etc. . the bag come with a nylon shoulder strap so you can carry the bag over you shoulder to free up you hand . this may or may not be useful depend on how you use the bag , but it be nice to have the option . con : \* value - this be purely subjective , but it seem that this bag should be less expensive than it be . be it handy ? yes , it be . be it essential ? well , no , I do not think it be . at the time of this writing , the bag represent about 13 % of the cost of the tool it be carry . I leave it to you to decide whether that be a good value or not . I have use Bucket Boss product in the past and they be still go strong , but that be carry dozen of tool , day in , day out , everywhere . this gunner bag be go to be carry one tool , occasionally , so the value proposition for I be not as sweet as it could be . \* gate mouth - I need to review the meaning of what gate mouth be , because I think that mean a opening that get bigger due to a semi-rigid opening that make the open to the bag much bigger . this bag do not have that , but instead it have a zipper that run the length of the bag . do it matter ? the zipper work just fine , and the bag swallow my framing nailer , so I guess not . still , my expectation be different from what the product actually be . -lrb- I 'll allow that I may be confuse about the meaning , for sure -rrb- other thought : I do not see this as a essential item , but it be nice to have depend on you use . I be a contractor , but not a full-time rough carpenter or framer , so I will not be use my framing nailer on a daily basis . in my shop , this gunner bag will be protect my tool from dust and bump until I use it again . if I be to use my frame nailer every day , I do not know that I would spend the money on protect the tool that would basically get use to death and then toss . professional framer , what do you think ? for this reviewer , this be a good and useful bag that I be happy I purchase . yes , I think it could have be have for less give that the quality be ok but not fantastic , the material be decent but not top quality -lrb- zipper -rrb- , and it be make in China . -lrb- not to knock China in this case , but while they manufacture this bag about as well as anyone , let 's face it : it cost the factory penny on the dollar to produce this item -rrb-