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There's no single "be all end all" SPR configuration. An SPR is a Special Purpose Rifle. It is merely an up-modded M-16 or AR-15 with design features to accommodate accessories such as Scopes, Night Vision, Lasers Systems, etc.
SPR is kind of an umbrella term for any M16/AR15 with third party attachments made to serve a special purpose.
So to answer your question, technically, you're not missing anything.
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