DPMS take down pins

[ram2500]

I recently purchased a new DPMS from a individual and I noticed that there is some play where the pins are. Is this ok, normal, fixable or should I have a smith look at it?

[TheCol.U.S.M.C.]

It's normal what the play is coming from is a lose fit between the upper and the lower rec.'s. Most AR's do this unless your lucky and get a tight fitting set or bought a high end custom AR. You don't have many options to stop it just part of owning a AR you could try this thing Called the Gapper i think it fits between the upper and lower they cost about 3 bucks but I don't think they help much

[willyj]

Originally Posted by TheCol.U.S.M.C.

It's normal what the play is coming from is a lose fit between the upper and the lower rec.'s. Most AR's do this unless your lucky and get a tight fitting set or bought a high end custom AR. You don't have many options to stop it just part of owning a AR you could try this thing Called the Gapper i think it fits between the upper and lower they cost about 3 bucks but I don't think they help much

Yes they do.

I have a DPMS 6.8spc wiht a gapper and it makes a really snug fit between the upper and lower.

[ram2500]

Thanks guys I will check into that.

[j427x]

some slack would be considered normal for an ar series. some (not all) of the weapons i carried while in the service were well--loose as a goose.

a commercial versions seem to be all over the place. my CDD/double star fits very tightly,my dpms/dpms fits tight , my LMT stuff fits pretty tight, DSA fits very tight and my cav-arms polymer fit is super-super duper- tight.

now my colt 7.62x39 is a bit on the loose side. not as loose as the military a-1 but noticeable. my colt a-1 upper is pretty gappy/loose. my 80's era bushmaster is sort of gappy and loose but not as much as the colts. they all seem functional enough.

a gapper plug might help them but i never bother with such things as long as the weapon functions i wouldn't worry about it much. some people swear that a loose fit affects accuracy. i have seen some very loose fitting rifles that shot very accurately so i don't think it has much to do with it either.

[TheCol.U.S.M.C.]

Originally Posted by j427x

some people swear that a loose fit affects accuracy. i have seen some very loose fitting rifles that shot very accurately so i don't think it has much to do with it either.

Never bought in to myself, I have a Yankee hill Upper and lower with no play at all Wish i could say its accurate but my barrel has been on back order for so so soo long I have other brands with little to lots of play I dont think it effects the accuracy at all. The Barrel is the most important part for tight group down range.

If you Have a True "Factory DPMS Rifle" your seral # should be all numbers, if there is a letter "K" at the end of the number the lower rec. was sold as a Lower and some one could have put any brand of upper on it and sold it to you. I try to match the brands of uppers and lowers more for color than fit but if you just dont like the slop look in to a DPMS upper the fit might be better

[j427x]

i just ordered a DPMS lpk to go with my stripped DPMS lower. when it arrives i'll check it for fit on the middy and the CDD-m4.
it will give at least a baseline to go on.

[j427x]

update

i just assembled the DPMS lower today with the DPMS lower parts kit. i then attached the DPMS lower to a brand new DS arms upper.

it fits pretty tight in the front pin area but it is a bit loose in the rear pin area. the rifle still lacks buffer tube spring,buffer ect- so it MIGHT get a bit tighter with the rifle finished.

it does seem a quite a bit looser than my others in the back pin area. but it could be just my finishing two very tight rifles a double-star and a cav-arms making it look looser to me than it really is.

good things about the DPMS with DPMS LPK. to me the trigger pull seems very good. not quite LMT/colt good but not all that far off and much better overall feel than i was expecting. i suppose i was expecting a trigger with 10lbs+ of pull and full of grit! and i figure it will get better with time. the DPMS has a very nice flat black finish. i don't think it is as good as my double-star but certainly better than some other lowers i have seen lately.

the mag well on the DPMS is a bit tighter than my double-star. p-mags do not drop free. it is not so tight they will hang up solid. it is about as tight a fit as the cav-arms in that respect.steel mags are fine.

i sort of figured that DPMS and double star are the same more or less since they are LAR forgings but there are some subtle things there i didn't expect --like the mag well being a little tighter and the plastic pistol grip that came with the DPMS LPK had to be spread out with a wedge before it would fit on the lower? never seen that before.


--this is one of the few non-franken gun builds for me. i suppose it is the only build that has the same LPK brand as the lower i have put together so far--although i will likely mix & match in some del-ton parts and other brands of parts to finish the kit later.

i don't think it is too loose--but it is certainly looser than most of my other AR-15/m4orgeries in the rear pin area.

[j427x]

update to the DPMS lower.

i played musical chairs with my ar-15/mforgery uppers and lowers today. it seems the DS arms upper i got from AIM is where the looseness in the rear pin area is.

i put the dpms/DTI middy upper on the DPMS nearly no slack at all. changed the DPMS lower to the CDI-charles daily upper--the same tightness = nearly no slack. placed the DS-arms upper on my other lowers and volia! the slack was there now!!! except in the cav-arms that is. the only conventional lower that wasn't so loose was a DS-arms witch was abnormally tight with all my other uppers.

the DPMS upper has the BCA forgings. the CDD has key-hole cerrio forge forging. the slightly loose DS-arms is a cardinal forge part.

none of the uppers i have including the DS arms has any slack at all with the cav-arms polymer lower.

so the slack in my dpms lower/DS-a upper is in the upper not the lower.

my only gripe so far about the DPMS lower is that some mags fit tight--a bit too tight for my taste. the dpms lower and dpms lpk makes for very good trigger about 4&1/2lbs out of the box. i could have got just got lucky on that though.

as with all things you might order the exact same parts from the same places and get the opposite--so YMMV!!

[j427x]

update to the update-

the DSA upper with barrel installed when placed on a finished DPMS or double star lower build has very-very little slack in it. it seems that the sum of the parts fit much closer than the same parts fitted without barrels-stocks and so forth.

the DSA upper in finished state is about as tight on the DPMS and DS lowers as the others. it does fit super tight on the DSA lower and cav-arms though. nothing at all wrong with the DSA m4 upper.