I purchased a set of Centurion C4 "HK-Style" Diopter Sights back in January 2010, directly from the manufacturer, for my LMT MRP Piston 16 Carbine:
https://centurionarms.com/index.php?option=com_content&view=article&id=115&Itemid=137
For anyone unfamiliar with these, they are similar to the sights that come on the HK416 and MR556A1 rifles, but are taller, for use on regular flat-top AR-15s. The reason for this is that, if one were to use HK416 and MR556A1 sights on a standard flat-top AR-15, they aren't the correct height, since the top rail on the HK rifles is taller than that of regular flat-top AR-15.
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I haven't shot my rifle a whole lot, and around September of 2010, I realized that one of the apertures of the rear sight drum was way out of round:
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I contacted the manufacturer, and was asked if I preferred to send back the rear sight drum itself, or send back the entire rear sight. I opted to send back the entire rear sight, and it was returned back to me with a new rear sight drum.
I still don't shoot my rifle nearly as much as I would like, and since I received my rear sight with the replaced rear sight drum, I noticed three things:
I found that all of the apertures are out-of-round, and that for whatever reason, on some settings, the "lip" or "edge" of the front of the rear sight drum is obscuring nearly the lower half of the sight picture:
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I also found that the rear sight won't adjust for elevation using an HK rear sight adjustment tool.
I'm very familiar with genuine HK-style sights, having spent many years shooting an SP-89 (semi-auto MP5K variant).
At present I'm waiting to hear back from the manufacturer as to what they're going to do to take care of the problem.
I like the concept of these sights, and I really want them to work-out.
I would greatly prefer that the manufacturer replace the rear sight drum with one that works, instead of just offering to refund the purchase.
The problems I'm having with the sights aside, I've found the sights to be generally well-made.
The only other issue I've had with the sights, which is minor, is that the finish of the front sight post is bare and reflective along its edges, and can't be blackened with aluma-black, so I will eventually apply some dull, matte black spraypaint to it.
https://centurionarms.com/index.php?option=com_content&view=article&id=115&Itemid=137
For anyone unfamiliar with these, they are similar to the sights that come on the HK416 and MR556A1 rifles, but are taller, for use on regular flat-top AR-15s. The reason for this is that, if one were to use HK416 and MR556A1 sights on a standard flat-top AR-15, they aren't the correct height, since the top rail on the HK rifles is taller than that of regular flat-top AR-15.
I haven't shot my rifle a whole lot, and around September of 2010, I realized that one of the apertures of the rear sight drum was way out of round:
I contacted the manufacturer, and was asked if I preferred to send back the rear sight drum itself, or send back the entire rear sight. I opted to send back the entire rear sight, and it was returned back to me with a new rear sight drum.
I still don't shoot my rifle nearly as much as I would like, and since I received my rear sight with the replaced rear sight drum, I noticed three things:
I found that all of the apertures are out-of-round, and that for whatever reason, on some settings, the "lip" or "edge" of the front of the rear sight drum is obscuring nearly the lower half of the sight picture:
I also found that the rear sight won't adjust for elevation using an HK rear sight adjustment tool.
I'm very familiar with genuine HK-style sights, having spent many years shooting an SP-89 (semi-auto MP5K variant).
At present I'm waiting to hear back from the manufacturer as to what they're going to do to take care of the problem.
I like the concept of these sights, and I really want them to work-out.
I would greatly prefer that the manufacturer replace the rear sight drum with one that works, instead of just offering to refund the purchase.
The problems I'm having with the sights aside, I've found the sights to be generally well-made.
The only other issue I've had with the sights, which is minor, is that the finish of the front sight post is bare and reflective along its edges, and can't be blackened with aluma-black, so I will eventually apply some dull, matte black spraypaint to it.
