Robocop1051 Posted May 24, 2018 Report Share Posted May 24, 2018 @Matt.Cross... @98Z5V... I'm calling you guys out first (mainly because I called R2 last night, so he's off the hook). Anyone that wants to participate is welcome here. I'm trying to get an idea of the difference in measurements between lowers. This number could determine the compatibility when mixing uppers and lowers from different manufacturers. I need both measurements "A" and "B". So far my numbers for measurement "A" shows AR-10B @ 1.61" and the LR308 @ 1.54".... I'd love to know your results. The B measurement could vary even more greatly (even with perfectly compatible receivers) due to the unpredictability of the 308AR receiver spec's. Please list your make/model with your measurements. Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted May 24, 2018 Report Share Posted May 24, 2018 I think that can be done without much difficulty. Quote Link to comment Share on other sites More sharing options...
Boot_Scraper Posted May 24, 2018 Report Share Posted May 24, 2018 PA-10 Gen II A= 1.570" (+/- .002") B= 2.155" Quote Link to comment Share on other sites More sharing options...
sketch Posted May 25, 2018 Report Share Posted May 25, 2018 matrix 7.62 A: 1.570" (+/ - .002") B: 2.277" Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted May 25, 2018 Author Report Share Posted May 25, 2018 I am going to be using this information in the design of my lower receiver, so I can be as compatible as possible with all LR-308 style upper receivers. I haven’t forgot about you Ron. There’s still a possibility of an AR-10A in the future Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 25, 2018 Report Share Posted May 25, 2018 Well, you've got the AR10B, Matrix Aerospace, PSA Gen 2, DPMS LR-308... I can add the Aero Precision M5 to the mix. Lemme dig one out. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 25, 2018 Report Share Posted May 25, 2018 1 hour ago, sketch said: matrix 7.62 A: 1.570" (+/ - .002") B: 2.277" Is this the Matrix with the angled-cut receivers, like an AR-10, or is this the new Matrix stuff with the rounded DPMS cut? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 25, 2018 Report Share Posted May 25, 2018 Aero Precision M5 receiver. A = 1.477" B = 2.277" That's off one of Rob's favorites... Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted May 25, 2018 Author Report Share Posted May 25, 2018 41 minutes ago, 98Z5V said: That's off one of Rob's favorites... This rifle is so badass! Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted May 25, 2018 Report Share Posted May 25, 2018 I’ll get you Mega, PWS, and LaRue tomorrow. I’m smoked and we are starting early tomorrow. Quote Link to comment Share on other sites More sharing options...
sketch Posted May 25, 2018 Report Share Posted May 25, 2018 (edited) 4 hours ago, 98Z5V said: Is this the Matrix with the angled-cut receivers, like an AR-10, or is this the new Matrix stuff with the rounded DPMS cut? not rounded dpms hi rail. Edited May 25, 2018 by sketch Shits Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 25, 2018 Report Share Posted May 25, 2018 Yep, that's the same version that I have. No need to pull mine out then. Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted May 27, 2018 Report Share Posted May 27, 2018 LaRue- A-1.5030. B- 2.1430 PWS A-1.5030. B- 2.2560 Mega MaTen A- 1.5395. B- 2.2600 Measurements for A done with a steel square on top of where B measurements were taken. B measurements were top to bottom clamped. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted May 28, 2018 Author Report Share Posted May 28, 2018 I guess I should add mine... SI Defense (do they even make rifles anymore?) A. 1.45” B. 2.25” Quote Link to comment Share on other sites More sharing options...
Rsquared Posted June 3, 2018 Report Share Posted June 3, 2018 On 5/24/2018 at 8:21 PM, Robocop1051 said: I am going to be using this information in the design of my lower receiver, so I can be as compatible as possible with all LR-308 style upper receivers. I haven’t forgot about you Ron. There’s still a possibility of an AR-10A in the future Does that mean you're gonna give me an AR-10A? All of mine are B's, but I'll always take a FREE rifle from a "friend" Quote Link to comment Share on other sites More sharing options...
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