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Check out the MP5-J model...there should be a pic with the low-rise rail attachment on it. It does ride very low..but you mount your RDS or scope in rings and attach it to that base. Whether or not it's high enough for you to use (googles, mask, etc...) or whether or not the scope/rds/etc...will be clear of the sights is unknown. More often than not...the optics will be higher than the iron sights...but the mount/base will block the usage of the iron sights.
You can get the "old-fashioned" HK-claw mount...which is quite high to begin with...and then mount your optics to that. The mount has a "tunnel" so you can still aim with your iron sights if your scope get's knocked out of alignment, or your RDS battery dies.
On some models (i.e. CA) the mounts attach quite securely (i.e. no wobble). On others...they don't quite fit...and if they squeezed hard enough to hold, they'd risk cracking the plastic body.
There is a "large" MP5 handguard....not sure if it's made anymore...and it's kind of weird looking. Aside from that...most foregrips can only hold mini batteries (i.e. small 2/3A sized cells). The largest capacity one I've seen is 1500mah...and it does fit.
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