Shotgun Forum banner

mossberg 500 sp 20gauge build

6.4K views 15 replies 6 participants last post by  SprayNPray_Timmer  
#1 ·
hello all,
first id like to thank everybody that posted to answer my questions about the remington 870. You hguys make more sense the books i have.

so here the list of stuff im getting tpgether for my first home defense shotgun build

20 gauge mossberg special purpose shotgun w/ 18.5 inch barrel and 6 shot magazine toob

knoxx spec ops stock (whever they actualy release the damn thing)

Tacstar reciever mount side saddle (20gauge 4 shot)

magfazine extension to 9 shots (any suggestions as far as brand and installation would be helpfull)

shotforce pistol grip forearm (unless its too long and would hang up on the sidesaddle/reciever. Any other ideas?)

I want to put some of the ghost ring sights on it, as thats what ive got on my turkey gun now. Would i need to buy a new barrel?

I also want a flashlight on the front with a pressure siwtch at the stock. Any suggestions?

also, what do ya'll think would be the best kind of ammo to keep in a gun of this build for home defense purposes. I realy like my neighboors so im a bit concerned about overpenetration.

id like to know what you very knowadgeable gentlemen think of this and if you have any suggestions please let me know.
 
#3 ·
you cannot extend the magazine on mossbergs. and you are going to have a hard time finding alot of those accessories for a 20 gauge. i'm not saying its a lost cause, but 12 gauge would be better. But thats just my two cents. Good luck and i look forward to seeing the finished project.
 
#4 ·
I think he's going with the 20g for the sake of his girlfriend/wife? Me too. It's too bad the aftermarket isn't more 20g friendly. :? .....................Yes. If you want more rounds than what the 500 will hold, you need to look at the 590. Although I'm perfectly content with my 500's capacity. I think, rather than worrying about having more rounds in your shotgun, you'd be better off with a handgun as back up. It's faster to reach for your pistol than reload your shotgun. Especially when under stress. But that's just my opinion.
 
#5 ·
dood you are very right about the aftermarket mod availability not being 20gauge friendly, but i've found the stock id like in 20 gauge and was able to find some velco on sidesaddles. I've definately incorporated the old 1911 into the defense plan...i hope to god i never have to use any of this stuff at home, but if cant knock someone over with 5 20gauge rounds id certainely unload the clip into 'em as well. On a lighter note my old lady shot the 500 today at the range and shes definately better with it than my 12 gauge. She shot 25 rounds as opposed to here usual 10 and was more accurate on the 2nd and third shots of her 3 shot volleys.
 
#7 ·
I wouldn't under-estimate the 20 gauge for HD. I was more or less implying that if you "miss" your target and run out of ammo, or if the gun jams. But I think 5 -6 round mag capacity should be enough for most HD situations. Sounds like you got it covered ....................... Let us know how it works out for you. I got this 500 for 130.00 used in brand new condition. I've been trying to make it jam, but it just eats em up and spits em out. It did hang up on me one time when I first got it. I cleaned it, polished the chamber and that was the end of that. :wink: I love it when I find deals like that.
 
#9 ·
I've never tried anyone elses, however, I have heard that on the metal spring types there is some slap back from the spring. After the recoil is absorbed, it pulls back to position but there is nothing to slow it down so it hits hard under the force of the spring. I am speaking of the type that has the springs in the end of a converted wooden stock, that is to say, the buttpad has the shock absorbing portion. I don't know about anyone elses stock but from what I understand, springs will take the force of recoil and slow it down, but there is no force to slow the return of the spring after the recoil is absorbed, so it slaps back. Call it reverse recoil if you will.
I took mine apart to see what makes it tick since you asked and it is some kind of polymer bar that absorbs the shock. There is no slap back. It seems to transition back to position as smoothly and quickly as it absorbs the shock. It's kind of a jell type thingy. I showed it to a gunsmith friend of mine(who gave me the above information) and he told me that these gummy springs are the real deal and are used in a lot of different industrial applications. Anyway, there are also 2 grooves that an inner aluminum and nylon portion rides on and the tube it sits in is all aluminum. You know how you hit a pogo stick and hear the spring rattle around inside? You don't get that with this. It's a nice quiet, tight setup and I like it very much.
 
#11 ·
well gentlemen the build is under way now. I got my 20 gauge sp two days ago and i already put on the flashlight mount and a heatshield. im taking it to the range today...we'll see how it does witout the stock and forearm im putting on it. I checked out the shoxstock stuff and it looks real good, but my friend absolutely swears by his knoxx equipment and he;s convinced me its a good idea to wait for the specs ops stock. A question about ammo...right now im shooting with 00buck, cause i figure thats the most powerfull id ever keep it loaded with, but does anyone know of any good "less than lethal" loads i could look into. My old lady's cool as hell and she brought up the point that our neighboors kids room is about 7 feet outside my outermost northfacing wall...overpentetration is a very, very large concern for me. What do ya'll think the best load for HD puposes is, keeping in mind i want to be sure it doesnt fly through my wall into my neighboors house.
 
#12 ·
http://www.boxotruth.com

#4 buck or #1 buck. avoid less than lethal rounds. If you do shoot someone with them any good district attourney working for the bad guy will say that you didn't use a real bullet because you didn't feel your life was in danger, and you shouldn't shoot anybody with anything if you don't feel your life is in danger. long story short, 4bk and lead only.
 
#14 ·
Ragin, Commander, Thanks for the response. :wink: Toc804, I don't know the answer to that but I just saw a post the other day somewhere on shotgunworld where somebody did a test like this. And if I remember right they said 00 buck would penetrate 8 sheets of 1/2" drywall, #4 buck would penetrate 6 sheets of the same. Don't quote me on that because I was unable to find the p[ost. If I do I'll let you know, or maybe someone could correct me if I'm wrong?................................If you wanted to, you could make a section of a wall and shoot it with different loads to do your own test. Just frame up some 2x4's, 16" apart (like most home construction codes call for) Add 1/2" drywall to both sides of it and put insulation in between.
 
#16 ·
you are correct CG, those results are from http://www.boxotruth.com. Try frangible slugs if you can find them. they penetrate very little but are devestating. I'm too lazy but somewhere in this tactical forum there is a thread i started called "the role of birdshot in home (appartment) defense" and at the bottom of the first page there is a link to an awesome website that shows how different rounds penetrate life-like density targets. check that out if you can find it.