Glockslap

I am waiting on the NEMO's Gen 4 upper, which should be here in *hopefully* less than 2 months. It is supposedly 3 oz lighter than my current DPMS upper. I am not sure if I will send off the barrel for contouring earlier, or ship it all together. I'm also going to add and A2 FH, which should also save me 1 ounce. So far, I'm -3oz for the upper reciever, -4 oz for the bolt, -7 oz for the CF handguard, -5 (potentially) for the barrel, -1 for the A2 FH (potentially), and -4 for the XM177 styled stock. Once all put together, I will have an exact weight. After checking for function at the range, I will have to try to find the lightest sights possible as well. If my math is working out, I'm at 6 lbs 14oz with current AP4 collaping stock, and 6 lbs 10 oz with XM177 styled stock (which might be pretty harsh in .308 due to it's reduced surface area; I may try to increase the surface/and or add a superlight recoil pad)

The numbers should be closer to 7lbs, since I am sure I can get 5oz off of the barrel, and now that you mention the A2 being lighter, another oz off from the FH. The key will hopefully be saving an extra few ounces from the NEMO upper receiver, but I can't seem to get in contact with them. Every ounce counts in this one <munch>

Sorry-forgot to mention in my post the changes to my weight post. Forgot this was not my original thread! The barrel is 2lbs 7.7 oz (below): Upper Receiver (no bolt/charging handle) = 4lb 8.2 oz Bolt Group = 1lb 3 oz Charge Handle = 1.3 oz Flash Hider/Washer= 2.4 oz Gas Block (no sight) = 3.1 oz (includes gas tube) Barrel (No FH)= 2lb 7.7 oz Handguard = 10.4 oz Upper Receiver (no bolt, with FA & DC) = 1lb .5 oz

Upper Receiver Broke Down! Happy to find the carbon fiber handguard is saving me over 7 oz alone 8) Unfortunately, no weight savings with the DPMS gas block vs. the adjust one :P

Sorry-it finally was broken down and I should have weights this weekend-at least what the stock components weigh vs. custom.

Added 5 round P Mag weight. This weekend I will have the AP4 upper broken down to be able determine exact barrel, handguard, and upper receiver weights. It should let me know if under 7lbs is achievable w/o going to radical.

Just received the carbon fiber carbine handguard and barrel nut-sucker feels WAY lighter then the scale's indicated 3.2 oz, and with the supplied barrel nut at 1.7, manages a rounded up total 5 oz when weighed together. Now to just find out how much the stock AP4 aluminum handguard+ barrel nut...I'm really hoping for at least another 4+ oz or more to save me a chunk of weight. Also waiting on SI Defense's Gen 4 upper which I hope will check in at 13 oz or less, and should hopefully shave another 3-4 oz off the stock DPMS upper receiver. Further, just ordered a short 5 round PMAG to help lighten the load for hunting (and stay legal).

Just updated the weight on a CAR15/XM177 "old school" collapsing stock and weighting on the CF handguard, which should hopefully be here tomorrow. Also spoke with SI Defense (NEMO) and trying to get a Gen 3/4 upper exact weight loss compared to my stock DPMS upper.

Looks like a maximum weight loss of 4.5 oz with the bolt carrier alone. As promised, here they are (sorry about the not so great pics): VS: Side by side: Here with the DPMS bolt, total weight: Adjustable gas block:

I really need to know the weight difference on these items. 1 ounce-not worth it. 3-6 oz? Worth it...maybe <dontknow>

Just ordered the JP light bolt and adjustable gas block. I will weigh them as soon as they come in. Indications show a potential loss off 5+ oz from the bolt group alone. Don't know if there will be gas block savings ( Ihope so) yet.

Lightest Upper & Lower Receiver? I think it was mentioned the SI Defense was the lightest, but how much is there to be saved over the standard DPMS?

Weight breakdown for a DPMS AP4 16.5 M203 notched barrel and gear. .308 DPMS AP4, no iron/optical sights, no magazine = 8lbs 2.3 oz Upper Receiver (total) = 5lbs 12.4 oz Lower Receiver (total) = 2lbs 5.9 oz Components: Lower Receiver (no buffer, spring, or stock) = 1lb 8.3 oz Buffer = 3.8 oz Buffer + Spring = 5.3 oz M4 Styled stock (collapsing) = 8.3 oz (7.3 if you remove sling swivel) Magpul CTR stock (collapsing) = 9.0 oz CAR15/XM177 Stock = 4.4 oz Upper Receiver (no bolt/charging handle) = 4lb 8.2 oz Bolt Group = 1lb 3 oz Charge Handle = 1.3 oz Flash Hider/Washer= 2.4 oz Gas Block (no sight) = 3.1 oz (includes gas tube) Barrel (No FH)= 2lb 7.7 oz Handguard = 10.4 oz Upper Receiver (no bolt, with FA & DC) = 1lb .5 oz Sights: Millet DMS 1-4x24 + heavy duty mount (w/o flip covers)= 1lb 8.8 oz Leatherwood Hilux 2-7x32 with quick throw rings= 14.9 oz Aimpoint T-1 and high rise mount=5.8 oz Magazine/Ammo 1 Round of .308 168 grain match = .9 oz Empty 20 round P Mag = 5.7 oz 20 round P Mag w/5 rounds of .308 168 grain = 10.2 oz 20 round P Mag w/20 rounds of .308 grain = 1lb 7.8 oz 5 round P Mag (20 cut in half)= 3.7 oz 5 round P Mag w/5 rounds of 168 grain= 8.3 oz This is just to put that info out there, so you can compare where you might find some weight savings.

I have had an interest in this topic for a long time. I want something at/below 7lbs to make it a more handy woods rifle. My nekkid DPMS AP4 weighs 8lbs 2oz, no iron sights, no magazine. I have been told the 16.5 inch barrel weighs 2lbs 7 oz and /i am hoping to get it turned down under 2lbs w/o chopping it further. This rifle will be well maintained but double as a hunting stick when need be or a plinker out to 500-600 yards. I will not go with a CF barrel, but just ordered a CF handguard. I want this project to work <thumbsup>

<munch>

I'm still going back and forth between and ADCO recontour to an already great shooter (1 moa with match), or just buying a barrel (est 1.5 lbs), and upper, and a bolt. What is the going rate and turn around for an upper reciever in .308 with bolt these days?

Yes, I would rather have it all done correctly, as I also lack some of the equipment to fully assemble/disassemble ARs.

Contour it is then...

-ADCO will contour for a reasonable price-big questions are to send the AP4 upper in, or buy/build a new upper. The AP4 weighs 8.2 lbs no mag, no sights. I guess forget the lightened BCG-thanks for the advice. Oh, Life is pain. I eat 45/70 Buffalo Bore's on a chopped Marlin and 3 inch 12 Gauge 15 pellet Magnums for breakfast. Thankfully, breakfast is only served once <laughs>

Suggestions on the lightest 16 inch barrels out there in 7.62x51 It would be nice if they were match grade, fluted, and threaded for a FH. I am looking over at Brownell's which has an 18 incher (non fluted but threaded) weighing in at 2.4 lbs. I'm wondering if that is my best bet, then send it to ADCO to chop & flute? <munch>

I have much interest in this as well. I would love a 6.5 lb .308 styled AR, but will settle for one at 7lbs flat. A thin, fluted 16 inch barrel should save a lot of weight. How does one go about safely "lightening" the bolt/reciever groups? Drill or flute where it won't weaken its structure? Use heavier springs to slow the bolt down to compensate? <munch>