AR15.Com Archives
 stripped lowers, quality by brand?
gmor  [Member]
1/22/2011 8:36:18 PM
i have used DPMS, Stag, S+W and Rock River in builds and don't see a lick of difference between them quality wise. is there any real difference in stripped lowers? thanks
Paid Advertisement
--
jerz_subbie  [Team Member]
1/22/2011 8:39:56 PM
Those are all quality lowers so the quick answer is, nope no difference.
HiredHitman  [Team Member]
1/22/2011 8:46:00 PM
Pick the rollmark you like the most.
gmor  [Member]
1/22/2011 8:54:31 PM
Originally Posted By HiredHitman:
Pick the rollmark you like the most.


i like the S+W with the cool logos on both sides and no caliber designation!
durabo  [Member]
1/22/2011 9:12:26 PM
short answer - no.

Long answer -

As long as they are in-spec... all parts fit inside properly within proper tolerances, and it mates to an upper with proper tolerances in fit... then its fine. You may have a different fit from upper to lower depending on many variables... milspec is a specification of measurements and tolerances and has some leeway for the ability to have a universal compatibility between parts ... no upper is going to fit the exact same to every lower.. and vice-versa.

Some lowers have special additions... such as set screw holes for adjusting over travel on triggers, tension bolts to adjust upper to lower fit, ambidextrous controls, sling attachment points, flared mag-wells, patterned fronts... etc. This varies from manufacturer to manufacturer and none of these additions change what the lower fundamentally DOES.

Lowers have NOTHING to do with accuracy.

Some lowers have a better finish than others... whether it be the color/smoothness of the anodizing or the lack of machine marks and extra material left over from manufacturing. This has nothing to do with functionality assuming leftover material does not effect function and create a tolerance stacking issue.

If you are worried about the finish... then that probably means you spend too much time with a magnifying glass looking at your rifle instead of shooting it... my personal opinion.

Basically all lowers do are hold things together and they are a low stress point... lowers have been made of plywood and still functioned. Sometimes you will run lowers that are made of exotic materials... or common materials not usually seen in standard manufacture. It is best to use standard forged aluminum lowers unless you have more knowledge on the subject and you are specifically looking for something special for a certain purpose.

Billet is technically weaker than forged, but as said before... lowers are a low stress point so likely youll never notice the differences in strength with normal usage. Billet is made by a different process with more ability to change the shape and styling... they tend to be more expensive and since they do not have a universal "spec" like forged lowers fit with other parts is on a case by case basis. Billet also occasionally has issues with the use of aftermarket parts specifically designed for use with milspec forged lowers. This is again, a case by case basis.

- I would like to stress that UNLESS YOU ARE A WORLD CLASS SHOOTER... FIT BETWEEN UPPERS AND LOWERS... BILLET OR FORGED... WILL NOT EFFECT ACCURACY.

When you pay for a lower you are paying for -

The name on it.
The special additions as noted.
The quality of the finish.
The name on it.


Ugh. that went on longer than i had intended
mstarling  [Member]
1/22/2011 9:23:31 PM
I pretty much agree with most of the comments here. I have Colt, BM, LMT, Stag, and Aero Precision forged lowers. There can be differences in the height and composition of the area under and behind the safety/selector (High shelf or low shelf) that are of interest to those that may use registered auto sears. Some of the Colts are complicated in that area because Colt chose to include a steel sliug in the forging that complicates the fitting of an auto sear. In addition, finish varies some as does the accuracy of the finishing machine work and the prettyness of the lettering on the lower.

Interestingly, price is not necessarily a good measure of best quality in forged lowers. Of the ones I have ... I actually like the cheapest the best. The Aero Precision lowers are dead nuts on for machining accuracy and finish is fine. They are marked multicaliber and use icons for the fire control. Lettering is done on a CNC rather than roll marked or laser etched. At $75 in singles they are very hard to beat.

Mike

BTW: The Aero Precision uppers are $60 in singles and are also very accurate, well finished, and fit lowers very well.
AlvinYork  [Team Member]
1/22/2011 9:41:27 PM
I like these posts, I posted a similar one a couple months ago, and was skewered for asking the question after so many posts. The only bad question is the one that is unasked. I always get pretty good info from posts like this.
arfn  [Member]
1/22/2011 10:04:06 PM
Not to hijack the OP's thread, but can someone post a pic of the difference between a high shelf and a low shelf lower? I have owned a bunch of Bushmaster lowers; am I correct that these are the "low shelf" type? I did a search on high shelf - low shelf and didn't find anything.
chadwick76  [Team Member]
1/22/2011 10:13:10 PM
I bought this one because it was #15 out of 100 produced in billet, other than that i usually look for a good deal.
jmreagan  [Member]
1/22/2011 10:32:11 PM
Originally Posted By mstarling:
I pretty much agree with most of the comments here. I have Colt, BM, LMT, Stag, and Aero Precision forged lowers. There can be differences in the height and composition of the area under and behind the safety/selector (High shelf or low shelf) that are of interest to those that may use registered auto sears. Some of the Colts are complicated in that area because Colt chose to include a steel sliug in the forging that complicates the fitting of an auto sear. In addition, finish varies some as does the accuracy of the finishing machine work and the prettyness of the lettering on the lower.

Interestingly, price is not necessarily a good measure of best quality in forged lowers. Of the ones I have ... I actually like the cheapest the best. The Aero Precision lowers are dead nuts on for machining accuracy and finish is fine. They are marked multicaliber and use icons for the fire control. Lettering is done on a CNC rather than roll marked or laser etched. At $75 in singles they are very hard to beat.

Mike

BTW: The Aero Precision uppers are $60 in singles and are also very accurate, well finished, and fit lowers very well.


I agree with your view on Aero Precision and the ones I have personally seen. I would bet money that my Spikes receiver is an Aero Precision lower. I bought the rifle as a whole from Spikes, and its a hell of a nice piece.
Cdenmark  [Member]
1/22/2011 11:34:10 PM
There used to be a list of lower manufacturers and who bought from which ones. I'd say true milspec dimension is the key and quality is pretty constant. I usually buy the best deal but I prefer very little engraving to more engraving. Lower is not a high pressure item and spec is the key in my opinion. Most any name brand is in spec just a matter of personal preference. Billet is stronger as a rule but not necessary with a lower, just adds expense but most billet lowers are high quality Being said, most every lower I have is a little different in some way. I've got Bushmaster, CMMG, LBR, Spikes, Colt, Superior and even a Sharps. Of mine the CMMG seems to actually be the best fit on multiple uppers and I like the finish also seems to be the best color blend to different uppers to me. Next would be Colt or Bushmaster toss up, then Spikes, LBR, Sharps, , and Superior. Seems all are manufactured on a little different side of spec to me. All work just fine, Superior didn't fit as many different uppers as well or mags but it did come with set screw to adjust a little trigger creep. LBR seemed a little on the loose spec on a few different uppers but not bad could see a little light, very nice finish. All but Bushy and Colt were less than $100ea. Sharps and LBR were less than $75. Never had a LPK install problem with any of them.
iNeXile556  [Team Member]
1/23/2011 12:05:20 AM

Originally Posted By arfn:
Not to hijack the OP's thread, but can someone post a pic of the difference between a high shelf and a low shelf lower? I have owned a bunch of Bushmaster lowers; am I correct that these are the "low shelf" type? I did a search on high shelf - low shelf and didn't find anything.

Your searchfu is weak. Entering "high shelf low shelf" in the search box found this. It is exactly what your asking for, check the last post on the page, posted by....me.
Alpha-Romeo3  [Team Member]
1/23/2011 12:38:59 AM
There are some minor differences besides rollmarks, take a look at this lower receiver FAQ tacked thread.

Most of the info in that thread are accurate except some speculation of which company makes who's lower.


AR Lower Receiver FAQ - link


arfn  [Member]
1/23/2011 10:37:43 AM
Originally Posted By iNeXile556:

Originally Posted By arfn:
Not to hijack the OP's thread, but can someone post a pic of the difference between a high shelf and a low shelf lower? I have owned a bunch of Bushmaster lowers; am I correct that these are the "low shelf" type? I did a search on high shelf - low shelf and didn't find anything.

Your searchfu is weak. Entering "high shelf low shelf" in the search box found this. It is exactly what your asking for, check the last post on the page, posted by....me.


Thanks!

Paid Advertisement
--