Icarus Precision is Known for its impeccable machining capabilities most notably their aluminum grip modules (Sig Sauer Pistols). The industry is booming with high demand leading to shortages for many components including upper receivers. Icarus Precision has designed stripped M4/9mm upper receivers with simplicity and budget in mind. Simple flat design features keep costs low while offering a modern/minimal appearance. This upper is constructed from Billet 6061 aluminum has no forward assist, brass deflector (full auto no problem), or dust cover. Finished in perfect Type 3 Hard Black Anno.