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Discussion Starter · #1 ·
As some of you recall, I have an XCR concept in mind for 2009. Here is my photochop



And here is the nearly final realized version











 

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Discussion Starter · #2 ·
Re: My XCR got an upgrade today. Impressions and pics insides!

I tapped off two mags and had to rush back to work. I need to zero the rifle and didnt really have time. I was mostly interested in the ergonomics and function at this point

The HK416 sights are a vast improvement over any AR15 sights I have used on the XCR. After double taps I dont need to reset my cheek weld as much. The HK416 rail has the same height over bore as the XCR, thus 416 sights result in a very snug, tight, consistant cheek weld even after rapid shots

With my Eotech 512, lower 1/3 cowitness is perfectly realized; the FOV is wide and open with the #1 aperture.

Recoil control felt better than with AR15 sights because of the tighter cheek weld, your head isnt bounced out of position as easily during rapid fire.

Also, I've completly negated the need for a new stock with cheek height adjustments, and the "entry stock" LOP is perfect as is. Essentially I no longer need a stock because the ergos are pretty much perfected.

I will dive into accuracy when I have time. The gun show is this weekend so I probably wont get to shoot till later.

Lastly, the one issue some might have is the fact that 416 sights are fixed. Well there is a solution for you too. HK MP7 sights do fold and have the same height as the HK416 sights. Here is a crappy photo, but the real nifty part is even when the sights are folded they function as "pistol sights"



Photo of airsoft copies, but you get the idea



If you want folding sights, its probably the best way to go.
 

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VB,

Where did you get the HK416 sights? How much were they?

BTW: Thanks for the gun porn... :popcorn:
 

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Discussion Starter · #4 ·
VB,

Where did you get the HK416 sights? How much were they?

BTW: Thanks for the gun porn... :popcorn:
I got them from a local company.

http://www.hkparts.net/index.htm
Adam Webber
355 N. 1200 W.
SLC, UT 84116
801.440.5060 Phone
888.470.5927 Fax
E-mail: [email protected]

For front and rear 416 sight it's $310.00

For a set of MP7 sights its $280 a set

In contrast, Troy BUIS, which are probably the most popular AR15 BUIS currently, clock in at $270.00 on average, which makes the 416's and MP7's competitive IMHO.
 

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Will the Troy sights have the same ergo as the HK? That will the deciding point for me. I picked up cheap BUIS at the last gun show in SLC ($80) I got a military discount. The way you describe the ergo of the HK I'm willing to spend a little more.
 

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I guess I'm ignorant on this topic, but why the Dial? Do you sight it in for different ranges and then just turn the wheel?

I've never seen them in person so I'm confused. I do like the functional when folded aspect of that though.
 

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Discussion Starter · #7 ·
I guess I'm ignorant on this topic, but why the Dial? Do you sight it in for different ranges and then just turn the wheel?

I've never seen them in person so I'm confused. I do like the functional when folded aspect of that though.
The rear sight has windage and elevation settings. Rotating the drum acts as a BDC

The front sight post is centered in the ring since all adjustments (windage and elevation) are done at the rear. "That way when your eye naturally wants to make the circular front sight hood concentric with the circular rear aperture, your POA and POI have a good chance of coinciding"
 

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Man those MP7 sites are tricked!
 

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The HK sights are the only iron sights I shoot worth a darn. I ordered mine from the same place you did, and just got the shipping notice yesterday. Glad to see that they will work even better than I'd hoped.
 

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I have a rear diopter/swiss front on my Sig 556 - big improvement, especially for precision fire at distance. Looks good man!
 

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Thanks for the tip on the sights. I just ordered the MP7A1 set from HK Parts. Nothing on the website indicated stock however so I have no idea when they will show up. I was actually going to get the Troy set from Larue (their package deal on the front and rear is the best price I have seen) but the combination of a better cheek weld and the BUBUIS convinced me to try them. Does anyone have these and do they lock in the up position like the Larue?
 

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Hmm... very interesting. I currently have Troys on mine, and they are of course designed for an AR15 and sit high on the XCR. Thus the cheekweld could be better, and, I had to bottom out the front post to get the XCR on target at 100yds. I'll be interested to hear how your sight in goes.
 

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Discussion Starter · #13 ·
Thanks for the tip on the sights. I just ordered the MP7A1 set from HK Parts. Nothing on the website indicated stock however so I have no idea when they will show up. I was actually going to get the Troy set from Larue (their package deal on the front and rear is the best price I have seen) but the combination of a better cheek weld and the BUBUIS convinced me to try them. Does anyone have these and do they lock in the up position like the Larue?
They're similar in design and function to the Knights 300M rear BUIS and their front rail-mounted flip-up. A spring loaded plunger holds them in the up or down position - there's no lock.
 

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These are really similar to the "HK" style sights on my PTR-91,and if they work the same,the philips screw on the side adjusts windage and the drum does elevation(different apertures for different yardages,1,2,3,4 yards).
 

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There's a phillips screw that adjusts windage. Elevation is adjusted with the threaded adjuster inside the drum, which has two small tabs that must be retracted while the adjuster is rotated. H&K makes a tool to do this, but mine (for my HK-91) is pretty worthless. I use a small pair of needle nose pliers that I modified by filing the tips square so they'd fit inside the tabs. Insert into the adjuster, squeeze, then turn the drum around it to change elevation. Easy peazy.

Once you've sighted it in then you don't need the tool anymore, and can just turn the drum to pick your distance.
 

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Once you've sighted it in then you don't need the tool anymore, and can just turn the drum to pick your distance.
That would probably depend on what load the sight was calibrated for,but it should be fairly close for same bullet weights.
I wish the aperture on the HK sights were a little bigger,it's hard for me to have a good sight picture and still focus on the target with them,but to each his own.
 

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Some years ago (actually, more than a few years ago; Mel Tappan was still alive...), Brownell's had a tool to ream out HK diopter sights. I recall reading about this thing.

HK sights tend to be a little snug on the view, but you do get used to it. They're good sights. I'd assume they're zero'd for the NATO 7.62mm ([email protected]), but you'll probably have more sighting error than there is variance in loading, assuming you're ballpark in ballistics.

The MP7 sights are interesting. If the Sabre Defense AUG ever drops, I'm thinking those and the Aimpoint T1. Maybe one of the small ACOGs. Something along those lines anyway.
 

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VB (or anyone else who might know), I know that Larue makes a T-1 mount in three heights. Does anyone know whether the mid or low mount would absolute co-witness with the HK BUIS? [This may have been discussed before, but I didn't see anything.]
 
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